Based on the follow-up thread, Andreas is testing on ArAnyM, which is an Atari ST emulator that shares JIT code with the UAE family of emulators (although it's

Based on the follow-up thread, Andreas is testing on ArAnyM, which is an Atari ST emulator that shares JIT code with the UAE family of emulators (although it's not immediately obvious to me what the differences are or who's forking whom). Someone probably needs to run the test on real hardware to settle this. edit: The bug was apparently found in another subthread, and wasn't seen by others because it was UB at some level.