I'm not sure if this is a bug or intentional, but when you crouch you can place crystals in every stage on doors and trapdoors.
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Can confirm that this is an issue. Also affects 20w51a and relates to MC-204022.
MC-204391
Amethyst Crystals/Buds on doors
Resolved
Works As Intended
0
This would be intentional I think. Most blocks that require support are now able to be placed this way, and pop off when the door is opened.