Hi

This is similar to #520 but for 1.7.10 and these biomes:
129 Sunflower Plains
132 Flower Forest
140 Ice Plains Spikes
165 Mesa (Bryce)
are being registered as:
Plains M, Forest M, Ice Plains M, and Mesa M, respectively. I can attest that Plains M does not produce sunflowers and is pretty much bare except for an occasional piece of grass (decoration, not the block). I have seen Ice Plains M but they don't have the ice spikes and Forest M is bare from what I can remember. I haven't seen the Mesa M yet but I'm expecting it to be problematic as well. Birch Forest M has also been seen bare, without birch trees.
This is found in 1.7.10
various Forge/BOP versions because I have noticed these anomalies for going on a year now. I found a Plains M biome that was bare using BiomesOPlenty-1.7.10-2.1.0.1640-universal and 1.7.10-Forge10.13.4.1566-1.7.10
Unfortunately, I have yet to locate any of these biomes during tests with a limited set of mods. These are usually found while playing the game extensively.
The mod list where I found the Ice Plains M biome that was bare has the following mods while testing something else entirely:

bspkrsCore:6.16
BiomeTweaker:2.0.167
Biomes O' Plenty:2.1.0
FastCraft:1.21
Generatormods-0.1.7(1.7.10)
Loot++:0.20_for_1.7
Mo' Villages:1.2.1
Restructured:1.0.4.2
Revamp:1.3.1
Special AI:1.1.2
Baubles:1.0.1.10
Thaumcraft:4.2.3.5
UndergroundBiomesConstructs-1.7.2-test42
CraftGuide:1.6.8.1
NBTEdit_1.7.10
VillageInfoSSP-1.7.10-2.1
worldedit-forge-mc1.7.10-6.0-beta-01
Just Another Spawner:0.16.18
CodeChickenlib-1.7.10-1.1.3.138
CraftGuide-1.6.8.1
Optifine_1.7.10_HD_U_D1

Using 1.7.10-Forge10.13.4.1566-1.7.10
Seed: 9122357122758623569
Location x2529, y, z1661

I hope this can help anything.

Thanks

We do not support the 1.7.10 version anymore, however, I'd really suggest trying to replicate this with JUST Forge and BOP. I mean, how do you know it's not an issue with BiomeTweaker, or even with Forge itself?

Well, since you don't support 1.7.10 anymore, I'm not going to try to play test this to chase down these biomes and see what happens. I brought this to your attention to try to help. I mean, why would I do this for the benefit of seeing if its simply BOP if nothing will be done, right.

I guess it's more of a future reference thing then. Make sure it's actually the mod you're reporting a bug for that's causing said bug before reporting it. We get enough bug reports as it is for things that aren't caused by BOP.