When trying to start the game with latest beta launcher it will fail to do so with a "Game crashed" error. (stable 2.1.5964 works fine) In the launcher_log.txt it looks like it can't find the main class even though it's clearly inside the version jar file? (And changing to a different version/making it redownload doesn't solve it)

More information like the system environment and tested java/Minecraft versions in the attached launcher_log.txt.

Possibly related to MCL-12098 although my launcher doesn't crash in Windows itself and the other issue is with an older launcher version.