[MC-60296] Crash when cutting grass: values=[sunflower, syringa, double_grass, double_fern, double

When I cut a lot of grass quickly the game crash. I tried it several times and always crash. It doesn't happen on the stable version (1.7.10).

Description: Unexpected error

java.lang.IllegalArgumentException: Cannot get property azh{name=variant, clazz=class aqs, values=[sunflower, syringa, double_grass, double_fern, double_rose, paeonia]} as it does not exist!
	at ayx.b(SourceFile:120)
	at aqq.a(SourceFile:280)
	at bnw.c(SourceFile:154)
	at bnw.b(SourceFile:71)
	at bnw.a(SourceFile:48)

Crash when cutting grass: values=[sunflower, syringa, double_grass, double_fern, double_rose, paeonia]}