No, the BFG worked fine on E4M9.
It worked hard on E4M8 at the moment with Spider Masterminds (Right along the way). It seems like they were right in my sights, but something prevents the BFG from firing. Perhaps it's not even your fault, but the creators of "UDINO" (There may still be bugs).
And what about the Cacodemons and Cyberdemons was on "E3M7: Limbo" at the very end of the Map with a bunch of Pinky, Barons, Cacodemons and Cyberdemons (Yes, this is crazy! I know!). Although, if we take into account the mess going on there, it is not surprising that the BFG Balls can fly the wrong way. There were, of course, such cases somewhere else on other Levels, but I will not name them, since I did not remember.