Temporary fix:
Go to %appdata%\.minecraft
Remove .tmp extension from all the files that start with launcher
The new launcher only creates .tmp files so the launcher data won't be saved. If I remove every .tmp file extension it will work and it will work properly.
And it should work after that
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This is not a duplicate, I'm having the exact same issue where it basically resets and loses all launcher settings. While MCL-19986 is a similar issue, they are NOT the same. To add to this, I assume that the person who posted this also has to log-in every time they launch the new launcher. If that is the case, this is because for some reason, the new launcher is creating temporary files (.tmp files) of the launcher files that are normally saved. As of right now, there is no fix I know of this, but please look at the screenshot I attached.
Does MCL-14797 and its duplicates describe your issue?
Thank you for your report!
We're tracking this issue in MCL-20028, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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As i said this isn't the same as MCL-19986 if i do anything in the new launcher it will reset after i open it again. This has absolutely nothing to do with that