Here's a video that shows my character fighting without any bugs at first, but after entering the dungeon at 00:37, my two handed sword becomes invisible. I'm not sure what causes it because I've seen it happen right after I log in or during a fight or, like here, after a loading screen.. This bug happens on another character as well, he uses two swords and a bow. But I've never seen this bug happen on a magicka character who uses two destruction staffs or one destruction staff and one healing staff.
I know that there's already a thread about this, but it's from a year ago and I want to spread awareness of this bug, because it's really annoying.
https://youtu.be/z1pRVtacHVQ