Please see the attached video. I think this is a serious bug. Items are missing. When the box is being put into the box by the hopper, manual items are put in at the same time. When the sum of the two is equal to 64, the entire group of items will disappear.
It affected the previous versions as well as the one right now.
Thank you for your report!
We're tracking this issue in MCPE-166390, so this ticket is being resolved and linked as a duplicate.
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