@rglr
In the footswitch configuration, if you select "Chan Select", "Chan Toggle", or "Chan Inc/Dec" for "Controllers", the large display of FM3/FC6/FC12 shows "Control NOT IN THIS PRESET".
The bug was posted recently
here by
@vz42
Another issue when you select "Chan Select" is the menu listed for the "2nd press". The "Smart bypass" option is available, but the Controllers page cannot be bypassed.
The mini LCD displays always show CTL 2 instead of CTL 1. Maybe this is the problem.