That’s about the only scenario in which group editing works properly when some lanes are collapsed (alt cut with comp tool). Swiping with comp tool fails. See screengrabs:
In this image, I have 4 tracks in a folder with group editing enabled. One track has lanes expanded.
I swipe with the comp tool to select a part on the second lane. Inexplicably, no cuts are made to the events on the other tracks with lanes collapsed.
I expand all lanes, toggle group editing to get the dreaded “tracks in the folder are not completely in sync” popup.
Slip editing with the comp tool gets messed up too if some lanes are collapsed (holding alt+ctrl while dragging horizontally), although this has the potential to go undetected for longer and really screw up sync, as cubase won’t complain when one toggles group editing.