I'm not sure if it's intended or not, but if a chest has a block above it, so it can't be opened (as shown in the picture), any hoppers connected to it don't deposit items in the chest. I have tested it in both survival and creative, and with both sizes of chest and with both normal and trapped chests.
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Doesn't that make perfect sense lol? works as intended imo

Duplicate of MC-7961, please use the search function to see if your bug has already been submitted. Currently over 50% of tickets are being closed as duplicate.