The game will not launch when trying to run the latest snapshot 18w22a. After selecting that game profile and clicking on the launch button the game will crash. Sometimes it will return to the launcher with a 'game crash' error, but not always. Game version 1.12.2 still works fine and 18w22a is fine on my windows 10 64 bit machine.
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Please do not mark unreleased versions as affected.
You don't have access to them yet.

Why are unreleased versions available as an option then?

The unreleased versions are for marking the fix version/s.

Please attach the launcher_log.,txt and/or the crash report.

When I set the launcher to remain open after the game starts I found that the launcher was crashing. We have used previous snapshots on this machine without problems. After encountering this issue for the first time I updated Java to the latest version, but it did not fix the problem.

Ok, so it was 18w22a not 18w21b . . .

See MC-129374