The M32/33 probabally don't wait for a Fin(ish) signal so the line of code issues it and drops through to the next instruction.
If any M codes that are not used trigger an output you possibly could rig something external, otherwise it means modifying the ladder, what control is it?
In most cases the Ladder is developed external and loaded, a few allow on line programming but it depends on the hardware fitted.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.