Some entities do not render inside of spawners and producing error log spam in console, potentially causing lag
Mob Spawners do not render a "mini" mob visual for the following entities:
- Bee
- Enderman
- Polar Bear
- Wolf
- Zombified Piglin
- Evoker Fangs
See attached images for expected (Elder Guardian) vs unexpected (Zombified Piglin). When the game attempts to render them but fails, it also produces an error message in the console over and over again, which can potentially cause a lot of lag in the world, especially when lots of spawners are used.
[01:00:15] [Render thread/WARN]: Exception loading entity:
s: Loading entity NBT
at aol.f(SourceFile:1642) ~[1.16-pre5.jar:?]
at aop.a(SourceFile:467) ~[1.16-pre5.jar:?]
at aop$$Lambda$4201/93583133.accept(Unknown Source) ~[?:?]
at v.a(SourceFile:401) ~[1.16-pre5.jar:?]
at aop.a(SourceFile:466) ~[1.16-pre5.jar:?]
at aop.b(SourceFile:529) [1.16-pre5.jar:?]
at aop.a(SourceFile:510) [1.16-pre5.jar:?]
at bpc.d(SourceFile:256) [1.16-pre5.jar:?]
at eei.a(SourceFile:22) [1.16-pre5.jar:?]
at eei.a(SourceFile:12) [1.16-pre5.jar:?]
at edw.a(SourceFile:107) [1.16-pre5.jar:?]
at edw.b(SourceFile:96) [1.16-pre5.jar:?]
at edw$$Lambda$4990/1816104835.run(Unknown Source) [1.16-pre5.jar:?]
at edw.a(SourceFile:128) [1.16-pre5.jar:?]
at edw.a(SourceFile:96) [1.16-pre5.jar:?]
at ebx.a(SourceFile:1236) [1.16-pre5.jar:?]
at ebs.a(SourceFile:717) [1.16-pre5.jar:?]
at ebs.a(SourceFile:540) [1.16-pre5.jar:?]
at dlx.e(SourceFile:1021) [1.16-pre5.jar:?]
at dlx.d(SourceFile:654) [1.16-pre5.jar:?]
at net.minecraft.client.main.Main.main(SourceFile:215) [1.16-pre5.jar:?]
Caused by: java.lang.ClassCastException: dym cannot be cast to zc
at ayk.a(SourceFile:260) ~[1.16-pre5.jar:?]
at aol.f(SourceFile:1633) ~[1.16-pre5.jar:?]
... 20 more
What I expected to happen was...:
A "mini" version of the mob to be rendered in the middle of the spawner cube.
What actually happened was...:
No "mini" version of the mob is rendered inside the cage.
Steps to Reproduce:
- Place down a spawner
- Modify the spawner's block data to the desired mob (can be done through commands or by right-clicking on the cage with the desired mob spawn egg).
Note: The spawner does spawn the desired mob. The issue is only visual – you cannot tell what kind of spawner it is just by looking at it.
Code analysis
See this comment.
Linked Issues
is duplicated by18
MC-190020Endermen don't appear inside spawnersDuplicateMC-190770Certain entities are not displayed inside of spawnerDuplicateMC-191411Constant error flooding while rendering spawners for neutral mobs.DuplicateMC-192377Certain mobs in Mob Spawners will not render and will spam the logs with errorsDuplicateMC-192378Certain mobs cause log error spam in Mob SpawnersDuplicateMC-192699Zombiefied Piglins,Bees,Enderman,and others don't render inside spawnersDuplicateMC-192755Some mobs dont appear in mob spawnersDuplicateMC-195918Zombified piglins don't appear inside spawners DuplicateMC-197756Spawners with zombie piglins greatly reduce FPSDuplicateMC-197906Lag with Mob Spawner (Enderman)DuplicateMC-198460Very critical bug with server softwareDuplicateMC-199684Output Log is spammed when using Mob SpawnersDuplicateMC-202102Spam of errors, while next to iron golem spawnerDuplicateMC-209934Five mobs don't appear in mob spawnersDuplicateMC-211587Polarbear Spawner generated a lot of warnings in the client log.DuplicateMC-217016Enderman and Zombified Piglin Spawners create Exceptions loading entity every tickDuplicateMC-218120Certain spawner nbt causes an error and a CastClassException casting ClientWorld to ServerWorldDuplicateMC-222945Problems with spawners and logsDuplicaterelates to6
MC-196141Experience Orbs in spawners are 2D instead of 3D
LowMC-779Some entities are displayed outside of their spawnerLowMC-255628Severe graphical performance issues when a mob in a spawner has an invalid death loot tableWon't FixMC-199429Evoker Fangs don't render in SpawnersLowMC-148893Fox spawners do not render the fox inside of the blockFixedMC-249686Fishing bobbers do not render inside spawnersWon't FixAttachments2
ImportantCreated Issue:
Mob Spawner doesn't render some entities
Mob Spawners do not render a "mini" mob visual for the following mobs:
- Bee
- Enderman
- Polar Bear
- Wolf
- Zombified Piglin
See attached images for expected (Elder Guardian) vs unexpected (Zombified Piglin).
What I expected to happen was...:
A "mini" version of the mob to be rendered in the middle of the spawner cube.What actually happened was...:
No "mini" version of the mob is rendered inside the cage.Steps to Reproduce:
- Place down a spawner
- Modify the spawner's block data to the desired mob (can be done through commands or by right-clicking on the cage with the desired mob spawn egg).
Note: The spawner does spawn the desired mob. The issue is only visual – you cannot tell what kind of spawner it is just by looking at it.
Environment
Windows 10
java version "1.8.0_51"
Java(TM) SE Runtime Environment (build 1.8.0_51-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.51-b03, mixed mode)
Attachments2
Windows 10 Home
java version "1.8.0_51"
Java(TM) SE Runtime Environment (build 1.8.0_51-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.51-b03, mixed mode)
Mob Spawner doesn't render a "mini" visual for some entities
![[Mod] tryashtar](../../../data/avatars/users/41963.png){kind=small}
relates to
![[Mojang] Adrian Östergård](../../../data/assets/gravatar/nighter.jpeg){kind=small}
Low![[Mod] violine1101](../../../data/avatars/users/92858.png){kind=small}
is duplicated by
![[Bot] Arisa](../../../data/avatars/users/43007.png){kind=small}
Mob Spawner doesn't render a "mini" visual for some entitiesSome mobs do not render inside of spawners anymore
Windows 10 Home
java version "1.8.0_51"
Java(TM) SE Runtime Environment (build 1.8.0_51-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.51-b03, mixed mode)
is duplicated by
Some mobs do not render inside of spawnersanymore
is duplicated by
is duplicated by
is duplicated by
relates to
is duplicated by
![[Mod] Chandler](../../../data/assets/gravatar/triwonder81.png){kind=small}
Somemobs do not render inside of spawnersSome entities do not render inside of spawners
Mob Spawners do not render a "mini" mob visual for the following
mobs:
- Bee
- Enderman
- Polar Bear
- Wolf
- Zombified Piglin
See attached images for expected (Elder Guardian) vs unexpected (Zombified Piglin).
What I expected to happen was...:
A "mini" version of the mob to be rendered in the middle of the spawner cube.What actually happened was...:
No "mini" version of the mob is rendered inside the cage.Steps to Reproduce:
- Place down a spawner
- Modify the spawner's block data to the desired mob (can be done through commands or by right-clicking on the cage with the desired mob spawn egg).
Note: The spawner does spawn the desired mob. The issue is only visual – you cannot tell what kind of spawner it is just by looking at it.
Mob Spawners do not render a "mini" mob visual for the following entities:
- Bee
- Enderman
- Polar Bear
- Wolf
- Zombified Piglin
- Evoker Fangs
- Experience Orbs
See attached images for expected (Elder Guardian) vs unexpected (Zombified Piglin).
What I expected to happen was...:
A "mini" version of the mob to be rendered in the middle of the spawner cube.What actually happened was...:
No "mini" version of the mob is rendered inside the cage.Steps to Reproduce:
- Place down a spawner
- Modify the spawner's block data to the desired mob (can be done through commands or by right-clicking on the cage with the desired mob spawn egg).
Note: The spawner does spawn the desired mob. The issue is only visual – you cannot tell what kind of spawner it is just by looking at it.
Mob Spawners do not render a "mini" mob visual for the following entities:
- Bee
- Enderman
- Polar Bear
- Wolf
- Zombified Piglin
- Evoker Fangs
- Experience Orbs
See attached images for expected (Elder Guardian) vs unexpected (Zombified Piglin).
What I expected to happen was...:
A "mini" version of the mob to be rendered in the middle of the spawner cube.What actually happened was...:
No "mini" version of the mob is rendered inside the cage.Steps to Reproduce:
- Place down a spawner
- Modify the spawner's block data to the desired mob (can be done through commands or by right-clicking on the cage with the desired mob spawn egg).
Note: The spawner does spawn the desired mob. The issue is only visual – you cannot tell what kind of spawner it is just by looking at it.
is duplicated by
Mob Spawners do not render a "mini" mob visual for the following entities:
- Bee
- Enderman
- Polar Bear
- Wolf
- Zombified Piglin
- Evoker Fangs
See attached images for expected (Elder Guardian) vs unexpected (Zombified Piglin).
What I expected to happen was...:
A "mini" version of the mob to be rendered in the middle of the spawner cube.What actually happened was...:
No "mini" version of the mob is rendered inside the cage.Steps to Reproduce:
- Place down a spawner
- Modify the spawner's block data to the desired mob (can be done through commands or by right-clicking on the cage with the desired mob spawn egg).
Note: The spawner does spawn the desired mob. The issue is only visual – you cannot tell what kind of spawner it is just by looking at it.
Mob Spawners do not render a "mini" mob visual for the following entities:
- Bee
- Enderman
- Polar Bear
- Wolf
- Zombified Piglin
- Evoker Fangs
See attached images for expected (Elder Guardian) vs unexpected (Zombified Piglin).
What I expected to happen was...:
A "mini" version of the mob to be rendered in the middle of the spawner cube.What actually happened was...:
No "mini" version of the mob is rendered inside the cage.Steps to Reproduce:
- Place down a spawner
- Modify the spawner's block data to the desired mob (can be done through commands or by right-clicking on the cage with the desired mob spawn egg).
Note: The spawner does spawn the desired mob. The issue is only visual – you cannot tell what kind of spawner it is just by looking at it.
Code analysis
See this comment.
Some entities do not render inside of spawners and producing error log spam in console, potentially causing lag
Mob Spawners do not render a "mini" mob visual for the following entities:
- Bee
- Enderman
- Polar Bear
- Wolf
- Zombified Piglin
- Evoker Fangs
See attached images for expected (Elder Guardian) vs unexpected (Zombified Piglin).
What I expected to happen was...:
A "mini" version of the mob to be rendered in the middle of the spawner cube.What actually happened was...:
No "mini" version of the mob is rendered inside the cage.Steps to Reproduce:
- Place down a spawner
- Modify the spawner's block data to the desired mob (can be done through commands or by right-clicking on the cage with the desired mob spawn egg).
Note: The spawner does spawn the desired mob. The issue is only visual – you cannot tell what kind of spawner it is just by looking at it.
Code analysis
See this comment.
Mob Spawners do not render a "mini" mob visual for the following entities:
- Bee
- Enderman
- Polar Bear
- Wolf
- Zombified Piglin
- Evoker Fangs
See attached images for expected (Elder Guardian) vs unexpected (Zombified Piglin). When the game attempts to render them but fails, it also produces an error message in the console over and over again, which can potentially cause a lot of lag in the world, especially when lots of spawners are used.
What I expected to happen was...:
A "mini" version of the mob to be rendered in the middle of the spawner cube.What actually happened was...:
No "mini" version of the mob is rendered inside the cage.Steps to Reproduce:
- Place down a spawner
- Modify the spawner's block data to the desired mob (can be done through commands or by right-clicking on the cage with the desired mob spawn egg).
Note: The spawner does spawn the desired mob. The issue is only visual – you cannot tell what kind of spawner it is just by looking at it.
Code analysis
See this comment.
Mob Spawners do not render a "mini" mob visual for the following entities:
- Bee
- Enderman
- Polar Bear
- Wolf
- Zombified Piglin
- Evoker Fangs
See attached images for expected (Elder Guardian) vs unexpected (Zombified Piglin). When the game attempts to render them but fails, it also produces an error message in the console over and over again, which can potentially cause a lot of lag in the world, especially when lots of spawners are used.
[01:00:15] [Render thread/WARN]: Exception loading entity: s: Loading entity NBT at aol.f(SourceFile:1642) ~[1.16-pre5.jar:?] at aop.a(SourceFile:467) ~[1.16-pre5.jar:?] at aop$$Lambda$4201/93583133.accept(Unknown Source) ~[?:?] at v.a(SourceFile:401) ~[1.16-pre5.jar:?] at aop.a(SourceFile:466) ~[1.16-pre5.jar:?] at aop.b(SourceFile:529) [1.16-pre5.jar:?] at aop.a(SourceFile:510) [1.16-pre5.jar:?] at bpc.d(SourceFile:256) [1.16-pre5.jar:?] at eei.a(SourceFile:22) [1.16-pre5.jar:?] at eei.a(SourceFile:12) [1.16-pre5.jar:?] at edw.a(SourceFile:107) [1.16-pre5.jar:?] at edw.b(SourceFile:96) [1.16-pre5.jar:?] at edw$$Lambda$4990/1816104835.run(Unknown Source) [1.16-pre5.jar:?] at edw.a(SourceFile:128) [1.16-pre5.jar:?] at edw.a(SourceFile:96) [1.16-pre5.jar:?] at ebx.a(SourceFile:1236) [1.16-pre5.jar:?] at ebs.a(SourceFile:717) [1.16-pre5.jar:?] at ebs.a(SourceFile:540) [1.16-pre5.jar:?] at dlx.e(SourceFile:1021) [1.16-pre5.jar:?] at dlx.d(SourceFile:654) [1.16-pre5.jar:?] at net.minecraft.client.main.Main.main(SourceFile:215) [1.16-pre5.jar:?] Caused by: java.lang.ClassCastException: dym cannot be cast to zc at ayk.a(SourceFile:260) ~[1.16-pre5.jar:?] at aol.f(SourceFile:1633) ~[1.16-pre5.jar:?] ... 20 moreWhat I expected to happen was...:
A "mini" version of the mob to be rendered in the middle of the spawner cube.What actually happened was...:
No "mini" version of the mob is rendered inside the cage.Steps to Reproduce:
- Place down a spawner
- Modify the spawner's block data to the desired mob (can be done through commands or by right-clicking on the cage with the desired mob spawn egg).
Note: The spawner does spawn the desired mob. The issue is only visual – you cannot tell what kind of spawner it is just by looking at it.
Code analysis
See this comment.
is duplicated by
![[Mojang] slicedlime](../../../data/assets/gravatar/slicedlime.jpeg){kind=small}
is duplicated by
![[Mojang] Matthew Gatland](../../../data/avatars/users/43046.png){kind=small}
[Mojang] Matthew Gatland![[Bot] Piston](../../../data/avatars/users/31202.png){kind=small}
is duplicated by
![[Mod] SPGoding](../../../data/avatars/users/44622.png){kind=small}
relates to
is duplicated by
is duplicated by
is duplicated by
![[Mod] Pokechu22](../../../data/avatars/users/92931.png){kind=small}
is duplicated by
is duplicated by
is duplicated by
![[Mod] Michael Wobst](../../../data/avatars/users/37868.png){kind=small}
relates to
Thank you for your report!
We're tracking this issue in MC-189565, so this ticket is being resolved and linked as a duplicate.
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Thank you for your report!
We're tracking this issue in MC-189565, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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![[Mod] Greymagic27](../../../data/avatars/users/92875.png){kind=small}
Does MC-189565 describe your issue?
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-189565, which is a report that has not been resolved yet.
If you want, you can upvote the parent ticket, and enable watching to receive any updates about it - if you believe you have any information that may be important for this issue, please leave a comment on the parent. Please also use the search function in the future to prevent duplicate reports.
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-189565, which is a report that has not been resolved yet.
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-189565, which is a report that has not been resolved yet.
If you want, you can upvote the parent ticket, and enable watching to receive any updates about it - if you believe you have any information that may be important for this issue, please leave a comment on the parent. Please also use the search function in the future to prevent duplicate reports.
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-189565, which is a report that has not been resolved yet.
If you want, you can upvote the parent ticket, and enable watching to receive any updates about it - if you believe you have any information that may be important for this issue, please leave a comment on the parent. Please also use the search function in the future to prevent duplicate reports.
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Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-189565, which is a report that has not been resolved yet.
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See MC-189565 for the issue in vanilla.
Duplicates MC-189565
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-189565 and MC-197756, which are reports that have not been resolved yet.
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Is happens with spawner
Bee
Enderman
Polar Bear
Wolf
Evoker Fangs
From MC-189565?
Merging with MC-189565.
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We're tracking this issue in MC-189565, so this ticket is being resolved and linked as a duplicate.
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The Bug
Evoker Fangs do not Render inside a Spawner
Command to Replicate
/setblock ~ ~ ~ minecraft:spawner{SpawnData:{entity:{id:"minecraft:evoker_fangs"}}}
Reason for bug creation
Due to a comment by [Mojang] Matthew Gatland on MC-189565 he requested a new issue be raised for Evoker Fangs.
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-189565, which has been marked as Fixed for an upcoming version - please do note that it's an upcoming 1.17 version and not 1.16.4.
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Duplicate of MC-189565
Duplicate of MC-189565, which is fixed in 1.17
Closely relates to MC-189565 and possibly MC-199429
The bug
If a spawner is created which is set to spawn players,
Skipping Entity with id minecraft:player
will be continuously spammed to the game log while the spawner is in simulation distance.
How to reproduce
/setblock ~ ~ ~ minecraft:spawner{SpawnData:{entity:{id:"minecraft:player"}}}- Look at the game log
Expected results
The game log would not be continuously spammed with the same message.
Actual results
It is.
How to fix
Since player entities are a special case which shouldn't be treated like other entities in cases like this, it may be worth rejecting such a spawner entirely, converting it to a default spawner instead.
Compare the following spawn egg:
/give @s bat_spawn_egg{EntityTag:{id:"minecraft:playerror"}}
As the entity ID is invalid, it spawns a bat instead. Having invalid spawners converted to default spawners would make this more consistent and also avert this issue.
Relates to MC-779, MC-189565, MC-199429, MC-195599, MC-196141, MC-249451 and MC-249686. May also relate to MC-3867, MC-87183 or MC-111339.
The bug
If a spawner is placed which spawns a "2D" projectile entity which rotates to face the player, the shrunken entity model found inside of the spawner will also rotate depending on the player's facing direction, but in a weird way. This is especially easy to see in Spectator.
How to reproduce
- Place a spawner via the following command:
/setblock ~ ~ ~ minecraft:spawner{SpawnData:{entity:{id:"minecraft:snowball"}}} - Enter Spectator mode
- Enter the spawner
Expected results
Either the snowball would be unaffected by the player's facing direction and would merely be tilted just like all other entities in spawners, or it would always face the player directly and be unaffected by the spawner's tilt.
Actual results
It appears to be affected by both simultaneously, causing it to rotate weirdly depending on the player's camera angle.
How to fix
A cheap fix would be for either snowballs in spawners to ignore the player's camera direction or ignore the spawner's tilting of entitites.
A preferable solution, however, may be to give projectiles custom models distinct from item models (similar to arrows, but preferably make them customizable models like blocks and items have). This way, there would be no need for the projectiles to be forced to face the player (averting MC-57861's possible resurgence) as the model would be 3D.
Confirmed, also the log is spammed with this:
[01:00:15] [Render thread/WARN]: Exception loading entity: s: Loading entity NBT at aol.f(SourceFile:1642) ~[1.16-pre5.jar:?] at aop.a(SourceFile:467) ~[1.16-pre5.jar:?] at aop$$Lambda$4201/93583133.accept(Unknown Source) ~[?:?] at v.a(SourceFile:401) ~[1.16-pre5.jar:?] at aop.a(SourceFile:466) ~[1.16-pre5.jar:?] at aop.b(SourceFile:529) [1.16-pre5.jar:?] at aop.a(SourceFile:510) [1.16-pre5.jar:?] at bpc.d(SourceFile:256) [1.16-pre5.jar:?] at eei.a(SourceFile:22) [1.16-pre5.jar:?] at eei.a(SourceFile:12) [1.16-pre5.jar:?] at edw.a(SourceFile:107) [1.16-pre5.jar:?] at edw.b(SourceFile:96) [1.16-pre5.jar:?] at edw$$Lambda$4990/1816104835.run(Unknown Source) [1.16-pre5.jar:?] at edw.a(SourceFile:128) [1.16-pre5.jar:?] at edw.a(SourceFile:96) [1.16-pre5.jar:?] at ebx.a(SourceFile:1236) [1.16-pre5.jar:?] at ebs.a(SourceFile:717) [1.16-pre5.jar:?] at ebs.a(SourceFile:540) [1.16-pre5.jar:?] at dlx.e(SourceFile:1021) [1.16-pre5.jar:?] at dlx.d(SourceFile:654) [1.16-pre5.jar:?] at net.minecraft.client.main.Main.main(SourceFile:215) [1.16-pre5.jar:?] Caused by: java.lang.ClassCastException: dym cannot be cast to zc at ayk.a(SourceFile:260) ~[1.16-pre5.jar:?] at aol.f(SourceFile:1633) ~[1.16-pre5.jar:?] ... 20 moreWell, this bug appears for all mobs that have their readAdditionalSaveData(CompoundTag) method overriden + a call to readPersistentAngerSaveData which casts the Level to a ServerLevel. As renderers are client sided executing this method's code causes a ClassCastException (ClientLevel cannot be cast to ServerLevel).
A simple server side check should fix the bug.
can confirm for 20w30a
Evoker Fangs & Experience Orbs are also affected
@Algeseven – could you possibly clarify in which class the server-side check needs to be implemented? I've been patiently waiting for a fix for this but it seems like we're not getting one until 1.17 which is unacceptable in my opinion. I'm trying to create a patch to fix this myself as some features on my server depend on some of these spawners, and I'm having trouble determining where this check should go. Thanks in advance.
@Mike - A modder named Draylar made a mod on fabric to patch this bug. Using mixins, he added a check to make sure the world is not a client world before angerFromTag method gets called (yarn mapping names)
You can either use his mod or check his code to create a fix for your server. As for Mojang devs reading this, this is all that is needed to fix the bug and so far, I have not seen any side-effects of this patch as I use it with my own mods as well.
https://github.com/Draylar/angerable-patch
I have fixed this but the fix does not include Evoker Fangs or Experience Orbs, which have a different cause and do not cause log spam. Please raise a separate issue for them.
I have created a report for Evoker Fangs. See MC-199429 Experiance Orbs are not affected but just really small. See: MC-196141
Issue still happens in 1.16.4 pre 1
This should be fixed for 1.16.4, not 1.17. It is critical.
This bug still affects release 1.16.4 (vanilla client and server) using the following custom spawner:
/setblock ~ ~-1 ~ minecraft:spawner\{SpawnData:{id:iron_golem},SpawnCount:3,SpawnRange:4,RequiredPlayerRange:25,Delay:20,MinSpawnDelay:9600,MaxSpawnDelay:9600,MaxNearbyEntities:25} replaceSpamming the client logs with thousands of warnings about:
As a consequence, user logs can grow very large.
Still affects 1.16.5
Added, but note that 20w45a is a 1.17 snapshot, and fixes from those aren't present in 1.16.5; that you can reproduce in 1.16.5 doesn't mean that the bug isn't fixed.