Pressing Q on an item or activating dispensers and droppers to shoot out items removes the item from the world, and is impossible to get back.
Comments 3
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.
14w21a is an outdated snapshot. Please check to see if it occurs in 14w21b.