Description of the issue:

Greetings. As I began putting some mods together, I noticed that even on the current version of Immersive Engineering (0.14-95), none of its ores will spawn in modded biomes; they only ever appear under chunks containing vanilla biomes.

I have currently tested this issue in singleplayer worlds with Biomes O' Plenty, Traverse: Legacy Continued and Druidcraft. It seems to happen to any modded biome, regardless of world type (Default, Biomes O' Plenty etc).

I used WorldStripper and an X-Ray mod to verify where the ores were spawning to confirm this. The IE ore spawn seems to succeed in any chunks containing part of a vanilla biome, but fail entirely in chunks covered only in modded biomes. Ores from other mods succeed in spawning everywhere.

I also attempted to run Retrogen on the world; it seems to have been partially successful in adding IE ores to a segment of Biomes O' Plenty's chaparral biome, but not much further than that.

Finally, IE ores also don't seem to spawn in Minecraft's Lukewarm Oceans either.

Pardon if this is a duplicate; I tried my best to search for this specific problem, but the current ore gen issues do not seem to be related. Thanks for your time in advance!

Versions & Modlist

IE and Forge:

• ImmersiveEngineering-0.14-95.jar
• forge-1.14.4-28.2.3-client.jar
• forge-1.14.4-28.2.3-universal.jar

The issue happens with just IE and any biome-adding mod in a minimal instance:

• Druidcraft-1.14-0.3.1.jar
• traverse-1.14.4-2.0.3.jar
• mysticallib-1.14.4-1.16.1.jar
• BiomesOPlenty-1.14.4-9.0.0.262-universal.jar

These mods were used for debugging, but the issue also happens without them installed:

• xray-1.14.4-2.0.3.jar (Advanced XRay, for debugging)
• NaturesCompass-1.14.4-1.8.5.jar (Nature's Compass, for debugging)

Please let me know if I'm allowed to add screenshots! I have a few containing the biome name in F3 and X-Ray highlights.

Quick update: this seems to be happening to a small portion of "alternate" Minecraft biomes too, such as Tall Birch Forests.

The IE ores are highlighted to the right, in Plains and River biomes. I'm not sure if oregen requires biomes to be specified in the code, but there might be new alternate biomes missing from it. Hope this helps!