If I have an active tether session and then click on the gear icon to update the tether settings and making any changes to a live tether, hitting the return button causes LR to crash. It will not crash if I click on "Ok"
I have a team of computers using the following:
LR 11.0 or later
Big Sur or Catalina
Canon 6ds or canon 6dII.
This is an issue on all computers using the above set up.