Unable to launch older snapshots

I have been unable to launch any snapshots between 20w51a - 21w10a after the launch of 21w11a. When I try to launch any of those versions it says "Unable to launch Minecraft". I have asked many of my friends to see if they can launch the version but it doesn't work for all of them. It was working fine the day before 21w11a was released. But now has suddenly stopped. Some times there is nothing happening when I click play on these snapshots.