Trial spawners spawn slimes of "Size: 2" which otherwise never spawn
The bug
One of the trial spawners in the trial chambers can spawn slimes. It has two variants in size of the slime: 1 and 2. However the slimes that naturally spawn in slime chunks and in swamps are of sizes 0, 1 and 3 (small, medium and large). I would expect the trial spawners to only spawn slimes of sizes 1 and 3 (medium and large).
How to reproduce
- Find a trial chamber with a slime trial spawner
/locate structure trial_chambers
- Activate the spawner
- Wait until you get a slime with a size between medium and large.
- Observe its Size
/data get entity @e[type=slime,sort=nearest,limit=1] Size
Created Issue:
Trial spawners spawn slimes of "Size: 2" which otherwise never spawn
The bug
One of the trial spawners in the trial chambers can spawn slimes. It has two variants in size of the slime: 1 and 2. However the slimes that naturally spawn in slime chunks and in swamps are of sizes 0, 1 and 3 (small, medium and large). I would expect the trial spawners to only spawn slimes of sizes 1 and 3 (medium and large).
How to reproduce
- Find a trial chamber with a slime trial spawner
/locate structure trial_chambers- Activate the spawner
- Wait until you get a slime with a size between medium and large.
- Observe its Size
/data get entity @e[type=slime,sort=nearest,limit=1] Size
Added Category: Mob spawning
Removed Category: (Unassigned)
Added Area: Expansion B
Added Mojang Priority:
Normal
Added ADO: 1140463
Added Affects Versions: 23w46a
Added Affects Versions: 1.20.3-pre1
Added Affects Versions: 23w51b
Added Affects Versions: 1.20.4
Added Affects Versions: 24w14a
Added Affects Versions: 1.20.5-pre4
Added Affects Versions: 1.20.5
Added Affects Versions: 1.21-pre3
Added Affects Versions: 1.21
Does MC-266502 describe your issue?

Can confirm
Still in 1.21.