Yesterday, the biggest CS2 news channel(600k subscribers) on telegram made a post about this bug. Basically, when launching the game, you can enable sv_cheats and grenade preview. Basically, you can observe the grenade trajectory and see any opponents from the small window on the corner. After they post it, premier and competitive become unplayable. I know this bug may not be popular wordwide yet. But every player from CIS region is using it. It's been 2 days and Valve haven't done anything yet.
P.S. I played 2 matches today and both had players using this wh bug. They always throw decoy from T to CT to see the entire map and how many players on each site. they throw decoy/smoke to a site to check the player's positions, and they double nade or molly to push the player out. plz Valve fix this.