I can’t imagine being the first to discover this, since i barely play illari.
But on Busan City center, when placing the pylon on the walkways from below, the pylon glitches into the map geometry. It is a bit inconsistent though as shown in video below.
Stumbled into it in a quickplay match so at least it didnt make me loose SR…
Did not check if it affects other characters turrets.
The bug i described, in action