[GAMEPLAY] Nautilus Q is not triggered, direction marker remains visible later

Since 5.12 I've had several times that Nautilus' Q didn't trigger, especially in team fights, and that the direction marker (the blue arrow) became visible later without me pressing Q, and would not go away on right-click.

Unfortunately I have no reliable reproduction recipe.

I use quick cast with range indicators turned on (triggers on key-up, cancels on right-click)