This issue could be considered a duplicate of MC-300380
This is the same bug, but the linked report suggest its a vertical only pathfinding issue, it is in fact an issue with pathfinding to/from any Y value.
MC-301081
Copper Golems cannot pathfind routes where they would pass under a 1 block tall space.
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Thank you for your report!
We are tracking this issue in MC-300227, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Works As Intended, which means this is not considered a bug and will not be fixed. Please do not leave a comment on the linked ticket.
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