The bug
There is a cave setting for the buffet world generation, and activating the "bonus chest" feature for that cave setting spawns the chest above the ceiling bedrock making it unreachable.
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is duplicated by
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gaspoweredpick
Confirmed for 1.13.2-pre2.
Confirmed for 1.14.2
Can confirm, chest spawns at y=129
(edit: the seed is 9186297438031436043, buffet caves gravelly mountains+)
[media]+[19w39a]
Can confirm in 21w16a with a custom datapack.
Related to MC-29613. I think the algorithm checks for a non-air block from the top of the world down.
Confirmed for 1.18 experimental snapshot 4.
Im Jotel, experimental snapshots are not supported on the bug tracker.
Can confirm for 1.17.1.
Can confirm.