It might be because of your Touch Input macros may still be tracking even after you change possession since it’s tied to the tick and it didn’t look like you were deleting / spawning in Pawns nor disabling tick, so the old one might be interfering locking the view since it doesn’t have a controller.
Although doesn’t explain why it works the first time around, but that may be because Pawn B doesn’t get “activated” until you actually possess it (and at that point Pawn A is still ticking).
I’d try disabling / enabling tick of the pawn when you posses the other.