i moved my data directory off and overwrote the minecraft install with a fresh download and am still getting the issue. to reproduce, just try to run the launcher without a network connection and it will continually fail and retry, taking the screen focus each time. i can't even get the wifi back on while it's trying to launch.
Thank you! I did see MCL-23741, but I do not think it's related because in this case the launcher works fine unless it's not connected to a network, and this involved some other behaviors like the incessant restart after the failure, which made the laptop unusable until it was rebooted or the user was forced to log out. I'll check and see if I can repeat it after following the fix steps in MCL-23741.
Please reopen this issue, since it is distinct from the one it's been labeled a duplicate of.