if you are in a chest while items are being taken out (like a hopper) you do not see it change until you close and reopen the chest. PLS FIX
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I've noticed that hoppers putting items into chests sometimes fails to update the chest gui. To check what has gone in, you have to close and reopen the chest.
I've noticed this in a slime farm, if you are checking a chest to see what has been collected, it doesn't update. This led me to believe that having more than one hopper going into a chest can trigger the bug.
To reproduce:
Set a line of hoppers going into a chest
Using a dropper and a simple clock, move items into the first hopper
Open the chest to see what items are being moved into it
Usually you can't see the number of items in the chest changing.
Edit: This was on 0.15.10 on Windows 10. I cannot reproduce the same issue in 0.15.90.8 on android.
please check if your using a trap chest. trap chest outputs a redstone signal when you open it (block below it) in your case a hopper so it locks it