This has happened to me 3 times within a week through different circumstances.

The first occasion I was wielding a Vaiga shotgun whilst walking through a building. A zombie attacked, so I switched to an axe the kill it. The swings of the axe did not register, so I ran. My friend alongside me told me that, on his screen, I was firing the Vaiga into the zombie (with no effect). I logged out and back in to find the Vaiga had disappeared.

On the second occasion, I was managing my inventory, preparing to bury some items. Some items I temporarily dropped on the floor - this included a USG45. After struggling to pick the weapon up via vicinity, I had to manually 'dig' through the pile of items, moving them aside so that I could put the gun in my hands. I put the gun in my hands and realised the magazine was missing. It wasn't on the ground, so I thought perhaps either my equipped bag or the nearby bag I had handled may had absorbed the item (a separate very common issue), but it was gone. I attempted to place a new clip into the gun but it refused to reload - I tried holding Y to reload, tried pressing Y in menu to equip and held A to drag - none of it worked. Again, I logged out and in, and it had disappeared.

The third was a KA74. My friend and I was traveling through Electro when I spotted another player nearby. I drew the KA74 and approached him. I spoke to him briefly and tried to restrain using handcuffs. The action timer completed but he was not cuffed. I then realised my KA had disappeared for m my back and inventory. I asked he check his inventory. He told me he couldn't open his inventory (yet another bug). I tried shooting him several times but he didn't die. All 3 of us stood together for another minute or two. Suddenly he dropped dead ( not sure whether through hunger/thirst or extreme resynchronisation from my shots). We checked his body and saw nothing. We cut him up and still nothing. I retraced my steps (which was only a few metres) and the gun wasn't there.

I'm finding these bugs extremely frustrating. You're charging full price for a game that is riddled with more bugs than I've ever seen. Hours of progress can disappear in a moment, totally unpredictably. Please fix this game.