1. I record a Midi file (ie press Record MIDI, then stop, even if not playing anything on my MIDI keyboard)
2. I open the previously recorded MIDI file
3. I press play:All the stops are turned on.

I looked at the MIDI event log. When recording the MIDI it is empty (I'm not playing anything, my MIDI keyboards are not sending any events).
When loading and playing the recorded MIDI, it starts with some sysexes, then some NRPN channel: 1, key: 0 and key: 123 etc. messages.
The result is all stops are turned on. And my combination triggering MIDI events are ignored later in the file. Actually all events are ignored except from one keyboard... I can see the events in the logs, while playing back the midi file, but it is not actually playing back.

So I think something became wrong with how MIDI files are recorded and played back.

This didn't happen with my old version (3.7.0), or with my 3.13 version.
Version 3.16.3-1, Win10 and Win11.