This is most likely not an actual bug as much as lack of information and my inability to find the information I am looking for but, I can't get armor stands to hold or wear block variants like Diorite or birch planks.

/summon ArmorStand ~ ~ ~ {Equipment:[{},{},{},{},

]} <--does not work
/summon ArmorStand ~ ~ ~ {Equipment:[{},{},{},{},

]} <--works

I have tried every version of the stone variant identifier that I can find but nothing works for this.