copper Golem cannot open chests placed above two blocks high (stacked double chest top)

The Copper Golem is unable to interact with chests placed above its head when they are part of a vertical storage setup (common in player bases, e.g., stacked double chests).
Most player storage rooms use a 2x1, with one chest above another. The Copper Golem can open blocks diagonally without directly seeing the container, so it is unexpected that it cannot open the upper chest.
This limitation makes the Copper Golem significantly less useful for typical storage automation or sorting tasks.