When placing a door in a position powered by a comparator such that while powered it would collide with the player and wouldn't collide when unpowered, it creates a ghost block of the top half of the door.
Expected behavior:
The door either would not be placed (because it collides with the player while powered), or it wouldn't be placed (because it collides when unpowered, and it can be thought of as being unpowered for a split second before detecting that it is powered).
If the comparator is changed to subtract mode, this stops occuring, even if it is changed back to compare mode.
This doesn't seem to occur when the door is powered by other redstone components. I haven't yet checked if it occurs with wooden doors or if a similar bug occurs with trapdoors, fence gates, or any other blocks that change collision when powered by redstone. I also have only tried placing the door where it's directly powered by the comparator (e.g., I haven't tried placing it where it's powered by a comparator through a block).
I know it occurs in 1.18.1, and I remember it occuring in an earlier version, but I don't remember which (I haven't yet tested in any other versions for this report).
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Can confirm.
Works with any power source. It's just slightly harder to do, although they all work.
Works with all door types
Can confirm as of 1.18.1.