If you spawn an iron golem as seen in the picture you'll find that they suffocate in a wall. This is due to their hit boxes being massive and could be fixed if the box was scaled more appropriately. I checked around as best as I could, and I'm yet to see another report of this bug so I'm pretty sure it's yet to be reported.
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SunCat
Thank you for your report!
However, this issue has been closed as a Duplicate of MC-103934.
It has been linked to this report. If you have additional information, please add it to that report.
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