Fought Edric again (first form) and was able to replicate the bug. It's an interaction between getting hit with Edric's shotgun ability and the roll function. You end up rolling into the floor. Repeating this interaction before you fall through the floor fixes the bug.

Im getting this problem too. It happened to me on Edric but happened again during Dashing (whateverhisnameis) quest. The other thing Im finding is clicking on loot is not easy in this game now!! took me several attempts to pick one item up lol

i have the same problem with this boss....and also.. when i tried to restart the game.. and then skip the cinematic since ive already seen it.... the boss is not there to fight...

I've also had issues falling through Wolcen. I don't know if this is the best place to put this, but my problems haven't occurred with the Edric fight yet. From time to time my character would be half submerged in the terrain. It would cause him to slide around or not be able move past a certain point. This became more apparent for me when in the Halls of Anankis. Using a leaping or teleport move seemed to remedy the situation most of time. The same issue seemed to be plaguing the larger spiders in the game too. Also, in the Halls of Anankis 2, I fell through the floor twice. The first time I was able to teleport mid fall back to the city. The second time I fell till I hit the Green Bluffs(?) area. After this, I teleported to Halls of Anankis 1 and trekked over to 2. At this point the game froze while engaging a mob.