When two or more dungeons generate together such that the wall of one dungeon intersects with the spawner of another, said spawner generates as cobblestone in the middle of the open space of the dungeons.
Steps to reproduce (outdated)
load seed 2795058148369038151 in Minecraft 1.16 or higher
bugged cobble/spawner is at -301, 46, 59
Linked issues
relates to 1
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pine1needle
pine1needle
I recently found out that this bug was previously reported as MC-112131. I'm unsure whether that report should be reopened and this report marked as a duplicate, or if that report should be left closed and this report marked as a clone.
Given how old that report was and that it was marked as resolved, I opted to create a new report rather than add to that one. This submission also better describes the issue and provides an up to date example in a normally generated world.
marcono1234
Cannot reproduce with the provided seed and coordinates anymore in 20w51a, likely due to world generation changes, and not because this bug was actually fixed.
In case someone is still able to reproduce this in the latest versions please provide seed and coordinates.
Unfortunately, this bug has been rare enough in past versions that it is not feasible to reproduce without a seed finder. Until a seed finding tool/program has UTD cave gen code, there is very little chance of finding an UTD example.
This would also be true for MC-163945, though to a lesser extent as that bug is relatively more common.
I was able to reproduce this in 1.16.3 using the provided seed and coordinates. Also, this is related to MC-163945.