While swimming to Skalisty Island my backpack and rifle including some clips were automaticly droped into the water. When pressing tab i saw them in the environment but couldnt pick them up. I continued swimming without my gear till i reached the shore of the island. I checked my Inventory and still most Items were missing, but not everything. So i went back into water and immediately my gear was visible on my character. I went out of the water and checked my inventory again, everything was pack in place.
After some time i decided to swim back to the mainland but the same happend again.
After all i didnt lost anything, but without going back into water for a short time my items were not visible or not in my inventory. Seeing my backpack and my gun on the water surface was at least for a moment very annoying.