When giving yourself a 2 block tall plant like a sunflower, they use the same block ID, 175. And the data value goes up to 5 (Peony). Giving yourself any 2 block tall plant with a data value greater than or equal to 6, Minecraft crashes.
Description: Rendering entity in world
java.lang.ArrayIndexOutOfBoundsException: 7
at agu.a(SourceFile:149)
at yn.b_(SourceFile:19)
at zg.j(SourceFile:404)
at zi.c(SourceFile:99)
at bkn.a(SourceFile:124)
at bkn.a(SourceFile:27)
at bkc.a(SourceFile:215)
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duplicates 1
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Confirmed.