Changing flags (booleans) in the origins_server.json file either in single, or multiplayer will not be recognized. Changes do not change anything in the mod.

Which specific version of Origins are you using?

can confirm, on the latest version, had to disable vegeterian passive for avian but failed as it ignores server-config.json in configs folder

Can confirm this happens on version, 1.21.1: Origins 1.13.0-alpha.11, ignoring all modifiable values for origins.