I double-carried a mosin (with PU-Scope) on my back and a Sporter .22 in my hands for a few hours yesterday and had multiple problems.
I really like the new chambering mechanic, but I like my mags full too, so after chambering from a magazine, I like to get the mag out and fill it up again.

Issue #1: I can't see that the weapon is chambered apart from the right-click "Empty" option

#2: when I empty a mag sometimes the bullets disappear, or the can't be stacked with similar rounds (all rounds pristine) or put into a magazine. I had a 10 and and 30 round magazine for my sporter. Relogging resolves those issues, after that I could stack and put the rounds in a magazine.

#3: I finally found some mosin ammo and loaded 5 rounds into the mosin. Again, you cannot see if the weapon is loaded and/or chambered. So I emptied the mosin and the rounds just disappeared, they were neither in my free inventory slot nor on the ground.
I loaded 5 rounds again and testfired it, it worked. So the gun is loaded but I have no indication of that.