When you try to use this command:
"/fill 28 64 14 20 64 14 unpowered_comparator 2 replace air 0"
That doesn't work, the game says :
"Invalid tag encountered expected '{' as first char"
But if you use this command (upside down):
"/fill 28 64 14 20 64 14 air 0 replace unpowered_comparator 2"
It works.
Linked issues
duplicates 1
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Comments 2
Filling tile entities is not supported, working as intended: MC-61864
Confirmed for
1.8.1-pre2 It seems the game is having with the block which should get replaced (also not working with minecraft:air)