I happen to come across this once when I was doing some scripting. I had accidentally deleted one of my scripts. I then just did the undo function and it restored it with a 0 run count.
Try something like this.
/system script remove NAMEOFSCRIPT
/undo
P.S. For giggles I thought I would see what happened if I put it in the original script instead of a separate one. It worked…
-Louis