Yes! The moment they become aware of their situation, everything changes. I dont get it either but eh manga logic (´-ω-`)
It's so frustrating! I get that our brains and experiences set our expectations and, having lived twice or whatever, they'd expect certain things to repeat. However, yeah, you're acting different so others act differently. An enemy becoming a friend is one thing, but being surprised that saving your father from dying is going to change shit is a stretch.
I get their pessimism though. A great example is "Beware of Brothers" where the MC stops her adoptive parents from dying only for them to die a bit later from something else. You don't want to assume anything in fear of failure, but come on. (︶︿︶)＝凸
It just really irks me when the villainess would say: "ah, things seem to be changing... nah, theres no way that can happen. No way ppl/events will change even though I'm actively not following the original story"......
Like, its literally happening as you speak. The story is changing. You do something the original wouldn't have, and you SEE ppl start acting diff... then THE STORY HAS CHANGED. It just makes me think the MCs are so dumb. Its not as bad when its a time travel one where they actually lived that life before. But for every other reincarnation or transmigration, its a huge facepalm.