The "Fronos River" biome gets overwritten with a different biome when REID (or even JEID) is installed. It becomes even more apparent when Biomes O Plenty is in use. The TellMe mod is used in these screenshots to show the error.

Mods tested for this:
More-Planets-1.12.2-2.3.3-GC4.0.6
BiomesOPlenty-1.12.2-7.0.1.2445-universal
RoughlyEnoughIDs-2.0.8

No REID/No BoP

REID/No BoP

REID/BoP

Can you see if this build fixes it? (Make sure to unzip)
RoughlyEnoughIDs-2.0.8.jar.zip

Got it, will submit PR later after the current one is accepted.

Can you see if this build fixes it? (Make sure to unzip) RoughlyEnoughIDs-2.0.8.jar.zip

Yep, that definitely fixes things up! Tysm!

Got it, will submit PR later after the current one is accepted.

Consider it done.