While it appears as though the islands generate with their own biomes, the trees/foliage seems to be stuck on one biome for all of the islands.

For example, all of the islands in this world seem to generate the foliage of a plains biome despite each island displaying different biomes in the F2 menu.

I couldn't recreate you bug, what version do you use and with what generator options?

I couldn't recreate you bug, what version do you use and with what generator options?

0.3.1 with default generator options.

I fixed this error, now everything should be ok

With old API it worked, with new one looks like not. I will make an update soon.