Fred and I discussed this last night, and it prevents a circular reference issue that locks up KoLmafia in a tight little loop of "A.ash:import B.ash", "B.ash:import A.ash". Probably would eventually crash, but we didn't wait that long. Swapped order on a test, and all seems well.
Lightly tested with a few real world scripts and new test cases A->B->A as well as A->B->C->A
This probably never actually happens, but now it can't and the functionality matches the documentation.
r20746