Truck trunk storage

I am a solo civilian salt miner, I have a large truck, after a lot of work i may have +300 refined salt in my truck. if I garage the truck, when i retrieve it the salt is gone, the water bottle and tool box that i had stored with it are still there so why not my salt. it is not an illegal item and should be retained through the garage/retrieval system like the toolbox, water bottle, and any other legal item.

P.S  it takes a long time (1 to 2hrs) to mine and process that much salt only to have it vanish with a server restart. It's bad enough with all the thieves and murderers doin there best to relieve me of my hard earned without bugs like this weighing in as well