New nether blocks generate under lava lakes and the ceiling
On crimson and warped forsets: Nylium and wart blocks generate below the lava on lava lakes and below the bedrock on the ceiling from around Y=32 to Y=28 the terrain seems normal with only netherrack and magma. after Y=28 nylium (and rarely wart blocks) generate like in normal terrain.
On basalt delats: The basalt generating on the seiling is only 3 blocks thick. On java it can reach the bedrock of the seiling and can contain "blobs" of blackstone near that level. Also glowstone generates in the roof, something that isn't on java. "lava lake floor" generation is in full parity.
On soul sand valleys: Glowstone also generates on the roof of the biome (like in a normal nether waste for example), something that has been removed from java.
Linked Issues
is duplicated by1
Created Issue:
Nylium generates under lava lakes on a forest biome.
Nylium generates on the surface of the bottom of lava lakes, where warped or crimson forests should be. That helpfull in specifing where a biome ends but thats not the way it suposed to be and for that reason i consider it a bug. (ps : that also happens on soulsand valleys and basalt delats after i did some searching)
Nylium generates on the surface of the bottom of lava lakes and under the bedrock sealing, where warped or crimson forests should be. That helpfull in specifing where a biome ends but thats not the way it suposed to be and for that reason i consider it a bug. (ps : that also happens on soulsand valleys and basalt delats after i did some searching)
Nylium generates under lava lakeson a forest biome.Nylium generates under lava lakes and nether sealing bedrock.
Nylium generates under lava lakes and nethersealing bedrock.Nylium generates under lava lakes and nether ceiling bedrock
Nylium generates on the surface of the bottom of lava lakes and under the bedrock sealing, where warped or crimson forests should be. That helpfull in specifing where a biome ends but thats not the way it suposed to be and for that reason i consider it a bug. (ps : that also happens on soulsand valleys and basalt delats after i did some searching)
On crimson and warped forsets: Nylium and wart blocks generate below the lava on lava lakes and below the bedrock on the ceiling from around Y=32 to Y=28 the terrain seems normal with only netherrack and magma. after Y=28 nylium (and rarely wart blocks) generate like in normal terrain.
On basalt delats: The basalt generating on the seiling is only 3 blocks thick. On java it can reach the bedrock of the seiling and can contain "blobs" of blackstone near that level. Also glowstone generates in the roof, something that isn't on java. "lava lake floor" generation is in full parity.
On soul sand valleys: Glowstone also generates on the roof of the biome (like in a normal nether waste for example), something that has been removed from java.
Nyliumgeneratesunder lava lakes andnetherceilingbedrockNew nether blocks generate under lava lakes and the ceiling
is duplicated by
- locate a lava lake under a nether waste biome (doesn't work on other biomes due to the bug
MCPE-74607) - run a fill command that replaces near lava with air (/fill ~20 32 ~20 ~-20 18 ~-20 air 0 replace lava)
- look for debrish
soon after (it may take some fill comands) you will find deprish exposed to air (previous lava from the lake)
you shouldn't find debrish as the debrish should not be exposed to air or lava
About fire, its random if it generates since fire is less common than lava in lava lakes, but it happened once as you can see on the photo.
has been resolved!
Thank you for your report!
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*Nylium no longer generate below the ceiling, but Soul Sand and Soul Soil still generating (and at the bottom as well)
The Bug:
Nylium, Soul Sand and Soul Soil can generate below the bedrock of the nether ceiling (and above the bedrock at the bottom)
Steps to Reproduce:
- Go over the nether ceiling:
/execute in minecraft:the_nether run tp @s ~ 140 ~ 0 90
- Go to Soul Sand Valley:
/locatebiome minecraft:soul_sand_valley
- Run this command to remove the bedrock:
/fill ~5 0 ~5 ~-5 127 ~-5 air replace bedrock
You will notice that under the bedrock there was Soul Sand, Soul Soil or Nylium.
- Go below the bottom of the nether:
/execute in minecraft:the_nether run tp @s ~ -10 ~ 0 -90
You will notice that above the bedrock there was Soul Sand and Soul Soil.
21w41a and 21w42a: MC-238930.mp4
, MC-238930-1.mp4![]()

21w44a: MC-238930 soul sand.mp4![]()

Relates to MC-171517 and MCPE-74607.
Expected Result:
Netherrack would generate below the nether ceiling (and above the bedrock at the bottom).
The Bug:
Nylium generates under the lava ocean in the Nether. This was covered in MCPE-74607, but that ticket got incomplete.
Steps to Reproduce:
- Create a normal world with cheats and with the seed: 0
- Go to spectator mode.
- Run command: /execute in nether run tp 18 26 130
- Look around until you see warped nylium under lava.
- Now run command: /execute in nether run tp 627 24 -9
- Look around until you see crimson nylium under lava.
Expected Results:
Nylium should not generate under lava oceans and should generate as netherrack instead.
Observed Results:
Both types of nylium can generate on lava ocean floors.









can confirm for 1.16.0.63! strange little generation bug.
May also allow crimson/warped "trees" to generate in the lava lakes
Uploaded a picture of what it looks like under the lava lakes, in the 1.16.0.63 beta
Generates the soulsand and soulsoil in soulsand valley's on java as well as basalt under the basalt delta's, so I'm unsure if it's supposed to do that there or not. However it doesnt generate the nylium in lava lakes on java.
uploaded a picture of what it looks like on java for comparison
OMG. Silent replied to my report. Im a big fan of your bugrock episodes. About this bug, thanks for the screenshots.
Here to help o>
I believe that the soulsand valley and basalt delta are supposed to generate under the lava lakes as shown in the two videos added.
Update: Nyliums, basalt/blackstone and soulsoil/soulsand generate on nether sealing under the bedrock
I guess this means that the floor and ceiling need to switch, so the basalt in the basalt deltas is in the ceiling, not the lava floor which will not be seen. Same with the soul sand valley.
I can confirm this bug affects 1.16.10.
Affects 1.16.100
affects 1.16.200
Affects 1.16.201
Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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