TL;DR of the post, generated automatically.

Unity is deprecating baked occlusion culling in 6.7.

• Deprecated: baked occlusion culling, built on Umbra, goes in 6.7.
• Why: can't be updated or ported, and works less well with the GPU-driven path.
• Existing projects: keep working, with Umbra supported through the 6.7 lifecycle.