Can confirm this issue is, yet again, back. It's definitely gnome-shell's fault, and doesn't relates to Ubuntu, as I'm using gnome-shell 3.34 "classic" session under Arch Linux. So this bug should probably be at GNOME team's watch.
As a sidenote, Block Caribou doesn't seem to work any longer as well.
Can confirm this issue is, yet again, back. It's definitely gnome-shell's fault, and doesn't relates to Ubuntu, as I'm using gnome-shell 3.34 "classic" session under Arch Linux. So this bug should probably be at GNOME team's watch.
As a sidenote, Block Caribou doesn't seem to work any longer as well.