Hi, thanks for the tip. hmm - rpgmaker MV is actually JavaScript, not ruby. The bug must be related to some condition / event , either a false chapter information or something similar that gives a false progression info...
Ruby must be from a different rpgmaker then.
I'm sure you know what that condition / event is and can look for it in F9. If it's true / false, then it's a switch. Otherwise it's a variable.