Endermen and Shulkers are able to teleport onto the Nether roof and custom dimensions that have the has_ceiling
property set to true / have a differing logical_height
. If an Enderman is holding a block when it teleports to the roof, it will be unable to place the block down since it's all bedrock blocks and will not despawn.
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Can confirm in 1.18

can confirm in 22w06a

can confirm in 22w07a

Can confirm in 1.18.2 pre-release 1
Can confirm in 21w37a.