Same issue on my own server. Add barrel, drive away and the barrel can no longer be interacted with.

Updated youtube link for video

Most definitely not trying to dupe things. I'm simply talking about clearing space to add a new item. An example...Last night I came across some matches which I had been looking for. I removed a can of beans to add the matches. The matches would not load in to my backpack, or allow me to take in to my hands. When I gave up, and went back to add my beans back, the beans had disappeared. This happened multiple times last night, costing me a 1911 one time, and a shotgun another. If this is a feature to stop duping, it's not going to work. We need to be able to set items on the ground to rearrange things and interact with items.

Yes, I've had the items show up outside as well, but sometimes they're just gone completely. I chalked it up to server lag, but not sure if that's the case.