After updating our server, the Mystic Grove biome changed to Old Growth Dead Forest as the chunks were loaded in. The Nature's Compass is still showing that this biome is the Mystic Grove and the trees are still correct, but the water effect and grass color have changed.

from what i was told, BOP in .34 removed a biome and broke existing worlds...you can roll back the BOP mod to the version that was in .32 to try and fix it

Is this something that is possible to do on a dedicated server without having everyone on the server make the same change to their modpack?

Looks like 0.2.35 was able to correct the issue, closing.