Having dynamic trees installed with this mod and selecting the "custom cubic" world type prevents dynamic trees from spawning it's trees instead of the vanilla ones. Dynamic trees do spawn when using normal world generation. These can also be grown from acorns etc. Only world generation does not agree

https://github.com/OpenCubicChunks/CubicDynamicTreesAddon is intended to solve it but it needs an update to be compatible with latest DT versions.

Updated and available on curse now.