Plant flax or I assume any 2 tall plant.
Place cobble/block over plant so flax can't grow.
Place powered nourisher and flax grows up into block.
Assuming the problem is the nourisher, but could be wrong.

Error:
The game crashed whilst ticking block entity.
Error: java.lang.IllegalArgumentException: cannot get property PropertyInteger{name=ayyge, clazz=class java.lang.Integer, values=[0,1,2,3,4,5]} as it does not exist in BlockStateContainer{block=minecraft:cobblestone, properties=[]}