Jaja probably not something that happens to everyone, but I consume a lot of trashy power fantasies and isekai, which many are extremely generic. I dont mind rereading, in fact I love it, I always read two manga at the same time, a new one to explore and an old one as comfort. But I hate doing it without realizing, I have felt like an idiot reading 40 chapters only to start getting flashbacks after I reached really important events, the feeling made me uncomfortable.

Also as a sidenote, having a list has helped me gamify my reading a bit, trying to score what I consume and also crafting a little note about each thing, so I remember the feeling and thoughts I had while reading has been an extremely enjoyable habit.