Question Upgrading VR project from 2020.3.8f1 to 2020.3.10f1 turns water black and OpenGL error

I recently upgraded my company's project (targeting Oculus Quest 1 and 2) from 2018 to 2020.3.8f1. The upgrade went relatively smoothly. I noticed afterwards that 2020.3.10f1 was the LTS for 2020, and promptly upgraded to that version from 2020.3.8f1. During my tests I found that all dynamic water in our app was now black - clearly not loading correctly. The only error I could find in adb logs was "OpenGL Error: Invalid texture unit!" spammed pretty heavily. I assume this is associated with the water not loading correctly. The water uses a custom shader on a material.

Does anyone have ideas on what could've caused this issue? I would've thought 2 minor versions would be a trivial upgrade, but it turned out to be more trouble than the entire 2018->2020 upgrade! Any help is appreciated.

 

Did you try reimporting the textures/materials and/or making new materials already?