Getting hundreds of dead NPCs after the navmesh update 18 SEP.
Claude says:

"The Rust dedicated server auto-updated at 03:00 today, moving from changeset 163794 to 164530. That build replaced Unity NavMesh with Facepunch's new RustNav system, which is why the log shows RustNav building oil rig navmeshes. Monument Addons 0.21.3 still assumes the old system. In its NPC post-spawn hook at MonumentAddons.cs:9566 it writes to the wrapped Unity agent through agent._agent, and that field is now null. The Sep 14 through Sep 17 logs have zero occurrences of this error on the same plugin version, so the game update is the only variable."