The one for the final(?) Heidi thing, where you visit her house and stuff. The bug doesn’t seem to be connected to that replay specifically, though; when deciding what saves I should send you, I checked one of my earlier saves that didn’t go through the final three replays yet, and doing that scene didn’t cause the change. I then did the Azh Rabot bazaar replay, and while Ellie didn’t move during that replay, when I started the last remaining replay (Emmie chasing Pro), Ellie was moved at the start.
Reloaded that save again, did the Azh Rabot replay first, then upon viewing another replay Ellie was moved, so it’s actually that replay that’s causing the problem, not the Heidi one, apparently.
I also decided to use the replay save to check the point of no return, and did not have the issue with getting stuck in bed there; the cutscene actually continued that time (though I haven’t watched it yet, because I wanted to get my saves to you sooner, and to do a bit more bug testing; I noticed that this time that orb was red instead of blue and there wasn’t a path out yet, though, unlike my earlier screenshot, in addition to the more obvious differences).
After that, I decided to reload that save again, did the Azh Rabot replay another time, then immediately left (and upon leaving the memory room, Ellie had already relocated again) and went for the point of no return. This time, the bed bug did happen. So it’s something there that’s causing this too, apparently. (During that replay, there’s also a building that I can see Pro and Clara inside of, despite them not being there when I did that scene the first time; perhaps that’s also connected to it? You mentioned that Ellie’s in her “end game cutscene spot”, and this seems like it could be something similar, which is part of what made me decide to test if they happened to be connected.)
Also, just remembered another replay-related bug: My first time doing these replays, I did the one where Emmie chases Pro first, then the bazaar one immediately afterward, and in the latter, Clara wasn’t following Pro, which wasn’t an issue during these tests. I think that it might be due to something like the chase replay setting you to just Pro, and the bazaar cutscene not undoing that when you start it, but I’m not sure how things work under the hood. It’s also not a major issue compared to the above, but it seems like it’s worth mentioning still.
Anyway, that might be enough information to figure out where the problem is, but I’ll send you some of my saves anyway, just to be sure.