Update 10/04/2018: Shadow Stones have been added back into the game, just in time for a this week’s challenge, which asks players to consume 3 Stones across 3 different matches.
In our time with the Stones since their reintroduction, there’s been no evidence of the previous glitches (and subsequent exploits) that forced their removal.
Shadow Stones, one of Fortnite’s new Season 6 additions, are being temporarily removed after players encountered a rash of problems with them, reports Kotaku.
Specifically, the items are making players permanently invisible, letting them use all their items and abilities while invisible, making them permanently move faster and jump higher, permanently granting them the dash ability, and allowing them to glitch inside trucks.
Source:: IGN – PS4