Practice Tool Bug

Hi,

When using the practise tool I turned on turret invincibility. The single bot in the game (Garen) had the rune demolish. When demolish is ready to proc he walks around the tower doing nothing. However, if I press fast forward 30 seconds, he does indeed proc it and slowly destroy the tower even with turret invincibility turned on.

Unless I am missing something I think this is a bug?

Thanks