On tours I've caused my camera problems off bike, e.g. dropping the camera or getting sand in the mechanisms.

Having the bike fall over, either unattended (parked improperly) or while riding is rare and not a normal operating mode. In the few times it happened, camera and other sensitive bits were not the only things in that pannier and those other things often cushion impacts.

On times I recall the last few years the bike has fallen, it has been inconclusive, e.g.
-- Got doored in Arequipa Peru in 2017. The right front pannier took brunt of the impact. The bike then fell to the left.
-- Right crank snapped in Texas in 2018. The bike fell to the right.
-- Parked against a wall leaning right. Wind came up and pushed bike to fall over to the left.
I expect the G forces in those isolated incidents were less than some of the rough washboard roads in South America.