Same here: I was using libinput-gestures with 3 fingers swipe for both switching workspace (vertical) and to do back/fwd in Firefox/Spotify/Lollypop… (I guess any GTK app that responded to Alt+arrows), horizontal, and since Gnome 40 3 fingers swipe is preempted by the shell.
So I’m looking for a way to control gestures in Gnome 40 in order to combine those two needs (either by combining 3 and 4 fingers swipe, or to switch back workspaces vertically or disable gnome gestures and use back libinput or anything else that can work).