bug issues
observer block can't detect moving objects using redstone comparator thru item frame using arrows in snapshot release 12 - 13 1.14
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In which version of the game are you?

1.14.1 version it seems that Observe block can't detect an object using redstone comparator.
I wanted to use item frame and arrow with redstone comparator. But it doesn't detect by the observer block.

Can you fix this problem

the comparator doesn't give a block update, it just changes state. to make this work, build a 1-tick pulse and connect the comparator to that.