When I open the Minecraft Launcher, log in and close the Launcher, when I log back in it gives me a login error. You should stay logged in and not log out. (This happens to users who do not have an internet connection and enter the Minecraft Launcher). However, I was testing a Minecraft client called Lunar Client that does keep the session for 24 hours and after that time, the session expires. For which I came to the conclusion that Minecraft Launcher has said bug which closes you the session when you reopen the Launcher.
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Thank you for your report!
We're tracking this issue in MCL-19645, so this ticket is being resolved and linked as a duplicate.
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Please don't duplicate your reports, MC-252664.