When place on fence posts, armor stands will fall through to the top of the next block. If this block is another fence post and the post is removed it will again fall through to the top of the next block. I find this bug interesting and actually think it could be quite fun to build with. I have included images of the stand in all the manners that I could make it fall.
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is duplicated by 6
relates to 2
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I have noticed this behavior as well with stands on upside down slabs of all kinds. If you unload the chunk and come back, the armor stands glitch through to the blocks below the slab. Can anyone else confirm this please? I think it might be related to this bug. I was unable to track down a similar bug report.
Should this report be reopened since this was fixed for spawn eggs (see MC-88096)?
I don't see why it shouldn't be reopened. If it's fixed for spawn eggs and placing an armor stand is very similar/ exactly the same as using a spawn egg, then there's no reason it should go unfixed for armor stands. It's been over 4 years since the issue was closed, and now the original reason for it being closed is no longer valid.
Relates to MC-12730
As of 20w27a you can’t place the armor stand on top of fences, walls and fence gates anymore. MC-222121
This happens with all items that spawn entities (Example: Spawn Eggs). The issue is that the selection area is in line with the visible surface of the fence, but the fence's collision is a half a block higher than that. As such, being inside the collision and not above it, it can just fall down.