If a dropper is facing a block with a full inventory, and it's own inventory has stacks of items greater than one, then it will set the item count of the stacks to one.
MC-8524
Droppers destroy items sometimes when facing a block with a full inventory.
Resolved
Duplicate
0
Duplicate of MC-7654, please use the search function to see if your bug has already been submitted. Currently over 50% of tickets are being closed as duplicate.