Here are two more. Echad Candelleth (or whatever it's called in central-south Trollshaws) was pretty much 95% invisible, depending on the angle. With the rain falling and the mist it might not be easy to see the detail of what is missing, but still... The first one is from the ground looking up to where the second floor would be, and the second one is from the second floor looking straight down through to the ground floor.
Also, I helped a kinmate through Tomb of Elendil. When we reached the arc of enemies who yak and fight in waves, I was experiencing a bug where I was falling through the floor (which was invisible) into the water beneath the floor. My character was stuck in a perpetual half-fall. I was splashing into the water below, then rubberbanding back up (due to the floor which was technically there) then falling, then rubberbanding, etc. I stepped back into the hall and came back out, and then the floor rendered properly and I was able to stand on it like normal.
Unfortunately, I have not updated my card (no updates available) so there's nothing for me to roll-back to. :/
R5 100 GRD Marevayave - Leader of Riddermarked For Death
R8 100 MNS Fayah/100 LM Siennah/100 HNT Dinenol/100 RK Dhurik
100 CHN Alachas/85 CPT Dinfaerien/60 BUR Dhax/35 WDN Godoric
R9 100 MNS Fayeh (alt Wilya) - Lonely Mountain Band @ Landroval