Droppers destroy items sometimes when facing a block with a full inventory.
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.
2013-01-27, 08:03 PM
2015-05-03, 07:19 AM
2013-01-27, 08:06 PM
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