i have seen this behavior multible times; unless you take their items, the copper golem will freeze in place over the same chest, and if you try to hit the away or try to push the golem, it will just return to the same chest and just stare at it. i have attached a video showing this odd behavior. (sorry for the spelling mistakes)
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We're tracking this issue in MC-300115, so this ticket is being resolved and linked as a duplicate.
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