When blocking all waking up places around the bed except one, and placing a boat one block above, when respawning you can go up blocks above the boat.
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Relates to MC-4389
Can confirm in 20w51a.

Can confirm but it also the boat had husks in it when I did it.
The bug works in 20w51a.
I could not seem to reproduce this from my test:
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If you're still able to reproduce this in 1.21, could you attach a video of the issue occurring with updated steps to reproduce the issue?