Sometimes when you step off a pressure plate that is connected to something, for example a fence gate, the gate stays open for a longer period of time then it should. Same thing vise versa so when u stand on the pressure plate, the fence gate is closed, but the gate isn't really closed. You can see a transparent version of the fence gate open when it looks closed. Sadly, I couldn't take a screenshot quick enough too see that image, but here's what I got
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Cannot reproduce - The fence doesn't just stay open There is a short pause but this is normal when briefly walking off the pressure plate.