Question Some textures display in one eye only

Hi all,
I'm building a simple nature environment for a VR project with OpenXR and I noticed the 5th terrain layer gives me problems.
A couple of the rock textures I have only display in one eye but become completely white in the other creating a disturbing effect.

Render mode is set to multi pass, tried to change to single instanced instead but it gives me a similar ploblem, only on the water material instead (but the terrain layer is fine).


I read that technically with the built-in renderer I should be able to fit as many terrain layers as I want (performance permitting), and in fact I can see it applied perfectly in one eye, but then it doesn't render on the other instead applying this bright white. And from what I understand multi-pass is the desirable option in this case. Is there any possible solution?