No, I have never heard of this problem. You said “It shows that the master has been started but in reality this is not the case.” — you mean the app / UI / lcd screen shows the master has been started? If so, that’s gotta be a hardware or wiring issue, because if the app / UI / lcd shows a zone is running that means the software has already turned it on. Also ‘run-once’ is done the same way as regular programs, except ‘run-once’ has a start time that’s now, while regular programs have scheduled start times. So I can’t explain why it works in regular but not run-once.