Using Summoner spells at game start - a possible bug

I made a test: When the game starts, your icon seems to be blocked as the champions haven't spawned yet but actually it can still be used. Once the champion has spawned you'll see that your flash is on cd.

So activable Summoner spells can still be wasted before the game has lasted 15 seconds. I somehow remember that this was updated in the past to save you from unlucky missclicks or am I just wrong?