I was in the middle of doing a run to the meth site and I started the meth twice and filled up a Zamaka Covered with meth and then I proceeded to rejoin get there and it was there once and then it happened again, second time I checked it was gone.
http://steamcommunity.com/id/Fall0utsVault0/screenshot/418062432481897491
http://steamcommunity.com/id/Fall0utsVault0/screenshot/418062432481886330
Screenshots of me having it and what was inside minutes before
http://steamcommunity.com/id/Fall0utsVault0/screenshot/418062432481897491
http://steamcommunity.com/id/Fall0utsVault0/screenshot/418062432481886330
Screenshots of me having it and what was inside minutes before