When the LWRP is used, single pass renderer has to be selected in the XR Settings.
In the Editor Gameview it is very convenient that the rendered camera can be selected, with the default renderer it renders correctly either left, right or both eyes.
But with the LWRP the camera selection (in screenshot below)on the top bar seems to have no effect (with the SteamVR plugin camera).
Hi there Aranir! When LWRP is active, it overrides a number of XR graphics settings. Go to the LWRP asset in your graphics settings, and then set the gameview render mode there.