Is it possible that a three phase motor still spin in the same direction it was even after the phases are interchanged.
I believe that I once heard that a motor with an open phase may start as a single phase motor if the other two phases are good. That can only happen if the load, or at least the starting load is very light as it would be with a fan. There is nothing to determine which way the motor might start except some characteristic of the load like a little air moving through by convection or something. If the two good phases are interchanged, that load characteristic would tend to make the motor start in the same direction regardless of the change.
If you swap any two phases, it should spin in the opposite direction.
HOWEVER if you swap any two phases instantaneously on a running motor with a high inertia load, it could conceivably continue to run in the original direction.
I can't swear to this with a 3-phase motor but it's certainly possible with a single phase motor with a run capacitor (which phase shifts a second winding).
So if such abuse tripped the reversed phases, the remaining phase could indeed power the motor in the original direction.
"Plug reversing" a running motor is not a good idea for other reasons. Braking to a stop then reversing will safely work as intended.
We need to know more about the context of the question : has this been suspected in an accident situation? is it part of a safety case? is plug reversing a running motor involved? etc.
Is this a theoretical swap because open circuiting a charged inductor is only a good idea if you want to generate an arc
If however the phasing was swapped "electronically" via control laws of a V/f controller, the motor would very quickly stall and start rotating in the opposite direction