Unity terrain not affected by lightmaps in VRChat. In Unity editor terrain looks correct but in VRChat lightmaps on terrain are missing.
Made a test world: terrain and cubes are static, directional light mode set to Mixed. Point lights mode set to Baked. Lighting mode set to Shadowmask. Realtime GI disabled.
Test world ID: wrld_a68baa2d-5877-4343-b2a3-2122e8342702