I’m cross-posting this in case others have issues, cuz it took me several hours to pinpoint what was going on here.
Currently, if you have a Chase Variable action, the variable being used cannot be used in any For loops, even if the Chase is never executed. This includes disabled rules.
Hm…definately something that should be examined. We could just speculate on why and how it behaves like that, either if its intended to prevent something or a plain unwanted bug.