I experienced phasing issue with 2.4.2 at two gigs few weeks ago.
I could not reproduce it (reamping, recording etc.) but today I found the reason.
And it is not only 2.4.2, the same issue is at 2.3.3 but somehow first time I hear it with 2.4.2 (coincidence!).
I have Eventide H9 in the FX Loop of Kemper. I use it for some ambience effects (eg. Ultra Algorithm).
So, the issue is, that I can hear very week (but is there; sounds as mix at 5%) Eventide Effect even if I do not have FX Block in X or MOD.
Of course Eventide is ON. I try it again with FX Loop in X (set to OFF) the same bleed.
So before the "issue" somehow I always had Eventide OFF, so I did not hear anything. At those evenings and few times at home with 2.4.2 I had Eventide ON, so I hear phasing or different sound (eg if I had some pitch or delay algorithm ON).
So, my issue is that effects in fx loop – even without the fx loop block in X/MOD – bleed into the sound.
UPDATE! This issue is ONLY at POWER AMP OUT (to speaker), so it explains the Live experience.
very useful!