I just had a quick peek on Mk2
There’s definitely some gremlins if you do this the way that you choose to
i.e whilst in EUC mode, enter Trig Mute mode using FUNC (as opposed to hold trig then hit bank/mute)
If you mute the second dimmed trig or third dimmed trig then the corresponding trig on real step 2 and step 3 (non euc mode) will be muted properly
In EUC mode if you were instead to press the first trig then all steps randomly light up - it isn’t making sense either
Likewise if you press in between the EUC steps (which as i have explained, do not exist within teh sequencer) then it also goes awry
If you press one or more of the legitimate lit EUC trigs and (whilst not entering via Func/mute) press the corresponding bank button to mute/slide/accent etc then the functionality is consistent (can’t recall if trig 1 goes flakey this way)
So there is certainly a ux issue that needs fixing, but there’s also a way to lessen the issue for now ( “mind the gap”(s) ) and use the Trig+Mute method
PS wrt your last point, a printed EUC pattern is no longer like it was before, you change the game when you print as all the printed trigs have moved position and now affect what happens in EUC mode
So you’ve definitely identified that there are pitfalls and a bug, but also that there are better approaches to consider whilst awaiting a fix
basically it shouldn’t be possible to accidentally misuse features, and it currently appears it is
you should send a ticket for this