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.
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.