Iron golems are now spawning on "non-spawning" blocks such as bottom half slabs and trapdoors. This is a new bug that did not happen on my world in previous versions. I have an three iron farms that is now affected by this bug.
MCPE-145057
iron golems spawning on bottom slabs and trapdoors
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We're tracking this issue in MCPE-140145, so this ticket is being resolved and linked as a duplicate.
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