[Gameplay] Demolish bugging out against nexus turrets

Since season 8 started this has happened numerous times. I was mostly playing Orn, lately Yorick as well.

Basically what happens is that against nexus turrets demolish charges up untill there are 2 ticks left, then if I attack it bugs out and goes back to full and doesnt come down. I have been watching this and if I charge it on both turrets at the same time, but AA only one it only bugs out the one I attack and always when it is at 2 remaining ticks.