If a copper golem is trying to get to a chest that is a block below, and it is standing on a block smaller than a full block and larger than half a block it will not be able to get to the chest. If the block is a full block it will be able to get down, if the block is a slab it will be able to get down.
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Thank you for your report!
We're actually already tracking this issue at MC-300129, so I will resolve and link this ticket as a duplicate.
I suggest also to browse through the main issue for potential fixes.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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This issue also occurs in 2 block tall areas where there is a slab on the floor and on the ceiling.