When the player gets in bed, they move into the bottom block of the bed as well as the one block further, instead of on the 2 blocks that the bed is made up of. It's hard to explain, so here's a video: https://youtu.be/swk127pvNDg
Note, this doesn't always happen. There must be specific requirements
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There must be specific requirements
Such as?

I have no idea. This has only happened once. The only thing I can think of is that there is a block above the head part of the bed

Can confirm with these 4 structures I posted. Another type of MC-112, I think