I was making a redstone video for my youtube channel. It is about a redstone banking system. In the process of recording, I was showing the viewers that it doesn't take items that don't belong in the system. You put an incorrect item in, and it will go all the to the dropper in the top. It dropped the item on the floor, and when I picked it up, it went into slot 1, and deleted my diamond which was in there. I checked my survival inventory, and it wasn't there either. I haven't been able to reproduce the bug ever since that. Here is a link: http://youtu.be/GcRFhMflJW0?t=1m10s
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Then what you should try doing is reproducing on a completely vanilla world. If you can, update the ticket.

Able to reproduce in vanilla minecraft.

Ok what are the steps to reproduce?


That has the steps to reproduce and I also reproduce it, not once, but TWICE. 🙂

Thanks for the vid, that helped a lot. This is a duplicate of MC-2912.

Okay thanks.
Okay thank you. Although, the only modifications I have are Zan's Minimap and Optifine, it still could have problems.