[GAMEPLAY] Demolish Rune can destroy invincible turrets

During testing my gragas mechanics I ve discovered that if u have demolish rune and you activate invincibility of turrets in practical tool, you can still damage them. Just wait 4s before the rune activates and the empowered hit actually damages it. Ive only tested it with graggas, but i tried it like 5 times and it always took dmg.