Save file:
https://www.mediafire.com/file/u8frcwf4c3peu6u/Repro.7z
1) Load the game and IMMEDIATELY pause the game.
2) Unequip hat.
3) Resume game. Hat will then be place inside the half-built wall. And then the hat got destroyed when the wall is built.
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Just tried it twice can confirm but if you un-forbid it first this doesn't happen, bug seems to happen because item is forbidden and therefore can't be moved by the game once wall is finished.
Meanwhile, that ostrich is staring right into your soul...
Fixed (for the next unstable build), thanks!