I have a map I published last year where I was using the "Legacy Shaders/VertexLit" shader for terrain debris. I tested and it was still working fine after the move to Unity 2022, but after the latest patch that removed Quest 1 support, legacy shaders may be broken on PC. See all the the bright pink rocks around the spawn point in https://vrchat.com/home/world/wrld_d6fb08df-c65f-41eb-ab63-70a89ecce7d4

I can always move to another shader and reupload, but I want you to be aware of breaking changes.