Bumping this old thread because it's still happening and it's annoying asf. My friend has no problem whatsoever; he sees the position of the key until the hero exits the ulti. I have the same behavior on all heroes.
Ye, it's a skybox limit issue, can be easily replicated if you take the middle line and double jump above the patron. Annoying asf and I wish they would fix it already.
My router is programmed to restart early in the morning, I forgot about this while playing some Deadlock on NA.
My internet connection dropped exactly during the countdown in the loading area.
After you reconnect you are stuck in that area for the rest of the game, jumping off the map teleports...