In the official Fortnite Forum, Epic Games announced that the Rifts will be deactivated. The Rifts are now gone, but with the next hotfix they should be activated again. This could have an impact on the Week 6 Summer Skirmish.
The Rifts in Fortnite: Since the beginning of Season 5 in Fortnite Battle Royale, you will find Rifts everywhere caused by the rocket at the end of Season 4.
What exactly was the reason that Rifts has deactivated the Rifts has not been called yet. Rumor has it that using a golf cart (ARK) could trigger a kind of God-Mode, so if so, it was good that Epic Games reacted quickly here.
We'll keep you up to date as soon as Epic Games reports on this, we'll let you know!