Damn, this "frozen dialog" issue is really annoying, and I can see it's been in the game for a long time now.
The save-load juggling didn't seem to help for me; After loading it back, the animation freezes again, and it freezes the dialog again.
And no, I do not think it's a "potato PC" issue; if I can play recent UE5 games decently, then this shouldn't be an issue either.