Im playing on server.
I've updated my test server with the last snapshot (15w38b) and when I joined, I've seen this bug :
When doing Shit+Left Clic in inventory, items disappears.
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migrated
MC-89003
[15w38b] Shift+clic in inventory ==> Item disappears
Resolved
Duplicate
0
migrated
migrated
(Unassigned)
Unconfirmed
Minecraft 15w38b
Retrieved
Thank you for your report.
However, your ticket has been resolved as a duplicate.
This issue has been linked to the original bugreport: MC-88929. You can find or add further information on that report.
Please search before reporting any bugs, as it's likely that one exists already.