Parsing abruptly stops while developing a preset

For the thrid time in a row, I have this experience where a preset, which includes parsing, suddenly stops parsing while further developing the preset in other areas (like changing colors, hiding or moving controls) .
Are there means to debug this cause?
I can recover to go back to a previous version.

What I observe after the parsing stops working :

When listening to the sysex via the webeditor, the sysex response is nicely coming through and the correct vales seem to be assigned to the appropiate parameter.

In regular (non-listening) mode:

  • the function midi.onSysex is still being called by incoming sysEx
  • the function parameterMap.onChange is still being called by manual parameter changes and lua changes (origin 0 and 2)
  • the function parameterMap.onChange is no longer being called by parsed parameter changes