Tested a direct OFF command against my own AC — works reliably every time, no reversion.
One thing I want to rule out though: @J33bee, looking at your two diagnostic reports, the successful manual OFF and the failed Flow OFF were actually sent to two different AC units, not the same one. Could you test both methods (manual button, then Flow) on the exact same single unit, back to back, and send a diagnostic report for each? That’ll tell us whether this is really about manual-vs-Flow control, or specific to that particular unit/model.
Oh, by the way. Feel free to write the user-message in dutch again as you did in the previous reports. It’s my native language too 
