A topleft hopper is connected (coupled) to a top-rigt hopper BUT:
When i use a hopper (top-left-side) a item don't go in a rigt hopper.
A item go's in a below hopper.
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megascience
Duplicate of MC-6162.
I believe this is intentional behavior. This way, you could have a line of hoppers feeding down, meanwhile having hoppers beneath set up in such a way they take out specific items before they pass along.