Step to do the bug:
1: Creative mod only
2: Open the inventory
3: Drop some item (only work by pressing Q)
Now when dropping, you will see that sometime an item drop (not everytime)
4: Pickup the items and see that you miss some (I tried 3 time and you pickup around 18 items (change depending of the speed of dropping)
ONLY WORK if it's in creative mod, if the inventory is open and that you press Q to drop items (Should work with Ctrl+Q)
I only tested on 1.14.4
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.
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