Reinhardt has a keybind that is not listed in the hero info. It’s the ability to look around in all angles while keeping your shield stable in one direction. It’s by clicking primary fire (left click) when you are holding down shield.
Now with the new major perk, where Rein shield bashes enemies. This is interfering. Because the new major perk has exactly the same keybind.
I cannot find a way in the settings to change this, since both abilities seem to be bound to primary fire internally. The free look while shielding now only works if the shield bash is on cooldown. If not it will use the shield bash when you want to just look around.
And if you use the look around while shield bash is on cooldown, and the cooldown ends, it will automatically pull your camera back.