Not sure if this has been mentioned at all.
It has happened a couple of times during my travels in the wasteland. I had XL in one hand and Avenger in the other hand.
Spawned on someone switched weapon from XL to Avenger but it acted like i had nothing in other hand switched back to XL that was correct and then switched to avenger again and that worked. But this has happened a couple of times with me now like 8 times wear it does not show the weapon in hand and acts like HTH char.
Nope gun was not shot out of hand, Yes i checked inventory to make sure weapon was still in my second hand.