On 0.59, I confirm the problem with a damage gun holster and a pristine plate carrier. As soon as the holster has been attached, the plate carrier became damaged. Detaching the holster leaves the plate carrier damaged.

Since the 0.57.128035 update, I don't have the issue anymore.

I now get this error each time I connect to the server.

I tried again but with 2 available slots on top of each others. The crafted saline bag IV appeared.

I got something quite similar but I wasn't carrying anything in hands. Inventory was full. I opened a can of spaghetti (the can was in my cargo pants and the can opener was in a cooking pot in my backpack). The can disappeared when the action completed. Few minutes later, I got the same issue with a can of tuna. I dropped few items from my inventory and the can of spaghetti appeared in my pants. I'm still hoping the can of tuna will reappear :p

I had a similar issue but with 2 available slots in my inventory. I tried to open a can of peach with a can opener. Once the action was completed, the can disappeared. I tried to make some space in my inventory and swapped a box of .22 with a heatpack (the box was in my pants, the heatpack in my backpack). The opened can appeared after the swap. I ate all the can but the box of .22 was replaced by a heatpack (I now had 2 heatpacks in my inventory). Both heatpacks seemed to be the same (I moved one to another slot but it's the second one that really moved). I swapped the heatpack with a lockpick and the box of .22 reappeared. Everything was back to normal.