I've stayed a few in-game nights AFK, Phantons have been spawning and I've been collecting drops but then I notice no other mob was spawning not even from spawners.
After a while exploring a cave, I believe on newer chunks, I heard skeletons burning and keep finding drops from skeletons and zombies inside caves. Then I managed to find some mobs and saw skeletons and zombie burning inside the cave with no sky access.
I managed to get some clips:
Mob Spawner Not Spawning. Found a spawner and there was burning skeletons inside no other skeleton spawned: [https://youtu.be/c0NUQIsoFFA
]
Mob Burning Inside a cave no sky access: https://youtu.be/QkOuD3VCQPQ
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I'm seeing this too. I believe my version was created in 18w16a (maybe earlier) but was run under 18w16a for a while and then this 18w20a/b/c cycle.
Attached a snapshot showing in an entirely enclosed area with no sky access the light is set to 14 (from 14 sky access) even though the only lighting should be the 9 block light.
This is killing spawning except for underground slimes. I AFKd over night at a mob farm and got zero drops. Thing worked just fine until 18w20a (though didn't try the 18w19 cycle because of the loading issues from 18w16a)
This is the same as MC-129792
Can't remember when the world was created but was before 18w16a. And it might have started in 18w20a but I didn't pay much attention
@unknown, this ticket is MC-129792
In what version did you create the world?
If not in 18w20b:
with what snapshots did you open the world?
do the issues persist if you recreate the world in 18w20b?