When dropping 27 stacks of 64 items in the same place on the ground some disappear (instantly?). When dropping them by destroying a full chest they dont disappear.
Her i demonstrate it: https://www.youtube.com/watch?v=P_z-ZODIH7Q
I could also reproduce this when dropping items like in the video in a 1 by 1 hole in a redstone ready preset world.
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Only seems to happen in creative mode https://youtu.be/fsMlL9OQJMc
Thank you for your report!
We're actually already tracking this issue in MC-116618, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
It looks like some of them are going over the barriers, have you tried making them 2 blocks high instead?