Selecting the "Turn off computer" option actually preselects the "Restart computer" one on the leave screen and vice versa.
https://cgit.kde.org/plasma-framework.git/commit/?id=208b94365ce0c583c3be2ecfc37740441d38bad4
Wrong bug ..
See also D25634
Git commit c4dc4bd452389b23178791cdc6816996235c562c by Kai Uwe Broulik. Committed on 03/01/2020 at 12:23. Pushed by broulik into branch 'master'. [kcms/ksmserver] Swap shutdown options With kcfg magic the order of the radio buttons determines the enum value. Just swap them so they're correct again. Differential Revision: https://phabricator.kde.org/D26077 M +4 -4 kcms/ksmserver/smserverconfigdlg.ui https://commits.kde.org/plasma-desktop/c4dc4bd452389b23178791cdc6816996235c562c