Just datamined from PTR, a change in the glyph of eye of killrog tooltip:
Glyph of Eye of Kilrogg Your Eye of Kilrogg is no longer stealthed and can now place your Demonic Circle. The casting Warlock must be within line of sight of the Eye of Kilrogg to place the Demonic Circle. In addition, the movement speed of your Eye of Kilrogg is increased by 50% and allows it to fly in areas where flying mounts are enabled.
This may indicate that it's getting fixed. Use it while it's possible still!