It's not just a VR thing, it's a fundamental (and pretty basic) modding mistake.
Add this to the config.
Code:
;fix shadow-casting sun in cockpit
[SHADER_REPLACEMENT_...]
ACTIVE = 1
MATERIALS = int_glass ; internal glass material name
CAST_SHADOWS = 0
Sadly, a lot of new mods are riddled with basic errors like this. Not just visual errors either, but basic physics issues too.
They either aren't tested properly in the rush to get a release out (for imaginary kudos from internet strangers, or patreon dollars), or the modders drive in chase cam using a joypad and never enter the cockpit out on the track.
Or for some unfathomable reason, just made as photo mules with driving a secondary consideration.
And it's a thousand times worse of course when stupidity, ignorance or lack of attention to detail is locked behind encryption.