Azir needs no Oracles

Just played against an Azir who told me, as Twitch, that my stealth was useless. This was confirmed by the fact that they always knew where I was when I was stealthed. Why could they see me? Because an Azir-created turret was continually targeting me for the entire game, drawing a line right to where I was, even after the turret had died. Best I can give to reproduce this is that the turret had just been formed with me within range, I killed Azir, the turret targeted me, but I got out of range before it fired. After that, the targeting line never went away.

Why exactly do Azir's turrets get little targeting lines anyway? Let's just add this to the long list of Azir bugs that are still a problem, months after his release.