I have looked at hoppers using the f3 menu to see if a hopper is enabled/disabled. It doesn't seem to update in real time, only when placed do hoppers show enabled/disabled in the f3 menu. I checked to see if redstone torches had this problem but they did not
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Duplicate of MC-60242, the state change is not communicated between client and server, which is what that ticket is about. (Title of it should really be changed.)