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Bug
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Resolution: Invalid
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None
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Minecraft 1.9.3 Pre-Release 2
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None
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Unconfirmed
I created a stack way over 64 with Cheat Engine (I know, not supported, but the bug is something else) and dropped the items. When picking up, the items are in normal 64 stacks, but on the ground they apparently stack over 64, because it were a million items and the entity count in F3 only showed ~30-40 entities. If they stacked correctly at 64 maximum, it would have been more than 15.000 items.
To be clear: I just used Cheat Engine to get into this situation easier, you can also reproduce this without, by continuously taking items of the same type out of the creative inventory and dropping them or creating chests and then breaking them, but it would take you much longer and the results wouldn't be as clear as this way.