FM9 fractal + MC6Mkii Ehanced integration?

hello from France,
Powering up the mc6 the “midi thru” command is automatically reactivated on my editor , this creates a midi loop which freezes the FM9.
→ Midi integration impossible with my FM9 for the midi synchronization of the names of the presets does not work. loop freeze ?
→ screen MC6 flashing on preset names then freezing of the midi editor

Do you mean that when you have already turned MIDI Thru off, and when you power cycle the MC6, MIDI Thru is turned back on? Can you share a video of this behaviour? You can press switch A+F to toggle MIDI Thru on or off.