When launcher is closed normally (alt+f4 or mouse), it saves all the data and no problem happens. However, when it is closed by Minecraft starting (actually launching the game), it forgets all the changes that were made, causing logout on next launcher open and installation settings updated lost.
Linked issues
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Thank you for your report!
We're tracking this issue in MCL-14797, so this ticket is being resolved and linked as a duplicate.
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Duplicates MCL-18924 MCL-14797