not sure what there is to be done about this. I loaded a world started in 0.9.4 in 1.0.8 and biomes were shuffled (even had a nether biome in overworld programatically, generation had already happened so no nether blocks were visible)

actually, was likely an even earlier version

probably marginal testing needed, but it turns out there were about 3 biome mods that were updated along with the byg mod and another biome that changed in the ow was clearly not a byg biome.
likely not a byg issue.

Is there anything I can for this? Seems like no...?

no i dont think so, doesnt seem like byg's fault after testing and the shift was from fairly old versions of several mods