The control room overview shows just what you are describing.
But the KEY here is that my experience is currently that the listen signal and the original track itself is TIME ALIGNED hence NO COMB FILTERING (no drastic tonal change). Which is good and expected.
My issue was that these signals were somehow NOT IN PHASE and produced comb filtering.
I hit solo and Listen on the same track and the tone was drastically altered due to comb filtering. Somehow the time delay calculations of the system were off for the listen bus and my original track.
In summary, theirs not much more info I can give you as after session restart I can’t repro. But this event did occur and is NOT expected to happen given the functionality of the control room (ie: it cannot be reproduced intentionally).
Thanks for your help, I’ll let you know if it happens again.