I was making a witch farm that worked in previous snapshots (it was designed by xisumavoid if that helps recreate the scenario) when after a witch dropped and died the water pushing them was still there. I went to check and saw the following issue (please note that the hopper in the middle of the picture has an item in it and is not transfering items)
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upon removal of the redstone block, the hopper still thinks it's powered. i removed all within 3 blocks of it. This problem remains until it recieves a block update.
Update: upon testing MC 92562 the effects are the same as my own problem. Thanks for the help.
Probably MC-92562 - let us know if this happens without the redstone blocks as well.