Using the new launcher, running any world or joining any server in versions over 1.14 or 1.15 will just crash the game with the error, "failed to create a child event loop".
Workaround:
Go to Installations, select and edit your profile
Click "More options" and on Java Executable, replace it with the following: "C:\Users*<yourname>*\AppData\Local\Packages\Microsoft.4297127D64EC6_8wekyb3d8bbwe\LocalCache\Local\Microsoft\WritablePackageRoot\runtime\java-runtime-alpha\windows-x64\java-runtime-alpha\bin\javaw.exe"
When using this version of Java, the game will run just fine like it was on the original launcher.
Linked issues
Comments 2
Thank you for your report!
We're tracking this issue in MCL-20005, so this ticket is being resolved and linked as a duplicate.
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LizterZapZap
Duplicates MCL-20005