I had the same issue, though I didn’t know it was a (directional? Side of chest?) issue…
Here’s my report that has been marked as duplicate by the mods: MC-300265
With the setup provided, if you insert an oak Sapling, log, stripped log, wood, stripped wood, plank, stair, or slab into the hopper at the top (going into the copper chest) the golem will take them and stick them in the double chest
Only it won’t get pulled from the chest until you click on and move any item in the chest…
PokeJake1127 - How is this not a bug? The expected behaviour of chests, which has been the same for as long as comparators have been in the game, is not behaving right when interacting with a copper golem…