Yes, caching recommendations can degrade engagement over time if the system is not notified of repeated exposures. When a recommender receives no feedback on items it has already shown, it loses the signal that non-engagement carries - treating a skipped item identically to an unseen one. The result is a recommendation loop where items continue appearing despite repeated non-engagement. The fix is ensuring every cached impression is logged back to the recommender so it can factor repeated exposure into future ranking decisions.