Hey There!Didn’t get a screenshot, but the game glitched at sauron’s eye in amon hen. Had to turn off server resource packs to get out, thanks!
when at Amon Hen, if you stand on the seat of seeing you will fall into a small hole with the eye of Sauron in. Though this will teleport you back up straight after. Is this perhaps what you saw? (This only lasts around 2 - 5 seconds)