Black and Purple texture blocks for the roots of a tree

this is fixed in commit e395f37; we haven't uploaded a jar to any of the sites yet but will get around to it eventually (also recently pushed some other bugfixes). if you want a quick fix, someone on the dynamic trees discord posted a datapack fix, or you can just copy the 3 json files from the aforementioned commit into the src/main/resources/assets/dynamictrees/models/block folder in the jar.