Issue with Microsplat Output inside of biome set graphs

MapMagic Version: 2.0.8
Microsplat Version: 3.8.6

Issue Description:
Using microsplat output inside of biome set graphs doesn't work as expected. It seems that microsplat output that is in the parent graph (containing the biome set node) works fine. But using the microsplat output insdie the biome set is ignored.

Steps to reproduce:

1) Open new unity project (I used version 2020.3.5f1)
2) Import microsplat
3) Import Map Magic
4) Open biomes tutorial Scene
5) Open the parent graph "Biomes"
6) Replace the snow biome with microsplat graph example "MicroSplatGraph"
7) Open the "MicrosplatGraph" from biome set
8) Microsplat output will have error saying it needs a material. Assign "MicroSplatMaterial".
9) Add 3 layers with index 0, 1, 2.
10) Regenerate graph and you will see that the textures from this graph have taken over all 3 of the biomes. Even if you add a microsplat output node to the other graphs in the biome set, it seems that 1 texture takes over and layering of the nodes is ignored. It seems that only having the microsplat output node in the parent graph (with biome set) works.

Hope this is helpful! For now I will try using functions instead of biome set.