When I replay an event in the gallery, I always lose the affection feature and I can't get it back even in normal playthroughs. Is it a bug?
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It is a bug, often caused by returning to the main menu before the event finishes. For the time being, try watching another event to its completion. When it returns to the main menu normally, it should reactivate the flag which summons the affection feature. In a future build, I'm hoping for it to be fixed.