Hello GoatZ and thank you for the report.
We are unable to reproduce this issue and everything seems configured right on our end.However, there are issues we are aware of which could be causing this.Could you please provide us more detailed info on the items your character had in inventory?
Regards,
Geez

I'll try my best, Geez. Thanks for the prompt response.

1. The first instance of it happening was to my friend and he had lost Black Cargo Pants while running down the hill from the civilian barracks to the docks on the new Prison Island.

2. The second instance happened to me where I also lost a pair of Black Cargo Pants, but I cannot recall where I was in-game. I did have something in them, but since leg breaks are still fairly common I only keep food in my trousers usually.

3. The third item was when I had switched servers. I was logging in behind a tree on the hill between Kamenka and the lighthouse on the hill that overlooks Prison Island. As soon as my character spawned in I had lost the Improvised Backpack (boar pelt, rope, sticks) that contained two first aid kits, medical supplies, a bit of ammo, some food, two PET bottles, lock pick, matchbook, steak knife. Some further items.

4. This time was yesterday. I was with a few friends near one of their stashes of loot wearing a Black Bomber Jacket that contained a Magnum with a Speed Loader attached. I was checking some backpacks when I noticed my jacket had disappeared. This location was about 300 meters East of the lighthouse overlooking Prison Island.

I believe their might have been one other example of this happening but I cannot recall enough detail to cite it for you today. I mostly play on Normal servers with third person and persistence, but sometimes I mess with private hives, hardcore servers, etc. This has only ever happened on third person, persistent, public hive servers.

This has only ever happened after 0.53 - let me know if you require more information.

Hello GoatZ and thanks for the quick response.
By any chance, did any of your affected characters have a book or any kind of M4A1 attachment in inventory?
Geez

No M4A1 attachments. The character that lost the backpack did have some books in his inventory. They were in fact in the backpack when it disappeared. None of the other characters had books.

I just lost my mp5 with 30/30 mag that was in my backpack the other day. Logged back in and it was gone. This is confirmed to be happening on a random day.

Hello GoatZ.
Unfortunately we still were unable to reproduce the issue you have described. Please retest once the next patch hits Steam and report back to us in case the issue re-appears.
Regards,
Geez