spruce village causing crashes?

I made a custom worldgen datapack by both merging some existing datapacks and creating some things on my own, but for some reason the game / server crashes randomly when a taiga village is generated. Doesn't matter what biome it's in, whenever the game tries to generate it, it crashes. I have no idea what could be causing this, as every other village type generates properly. It might have something to do with changed tree generation, but I'm not sure. Here's the crash report: https://pastebin.com/UrvDgPKt I have quite a few mods installed, but I don't think any of them cause the issue as the same thing happens on a paper server.