Crash with HarderFarming

[LemADEC]

As of prospects-1.0.6.a1 with Harderfarming-4.0.0d, an NPE crash was observed while creating a single player world.
It might be an HarderFarming bug too, not sure.
https://paste.dimdev.org/ixojefarug.mccrash

I did notice that prospects is notifying neighbors of change. If I remember right, this shouldn't be done during world generation.
In other words, here:
https://github.com/dizzyd/prospects/blob/master/src/main/java/com/dizzyd/prospects/blocks/BlockFlower.java#L54
should be

world.setBlockState(topPos, this.getDefaultState().withProperty(TYPE, flowerType), 2);