Seems to be working for me just fine. Created account, opened new doc, Cmd + Shift + S formats the text properly:
I would check brave://settings/system/shortcuts and ensure that that particular keystroke is not assigned to some other command. An extension you have installed may also be hijacking the command.
Thanks. Didn’t find it in system shortcuts but did in ‘keyboard shortcuts’ at brave://extensions (left side panel, under ‘My extensions’), identified as a Brave shortcut to suspend/unsuspend tabs. Is that a factory default? – I don’t recall creating it.
Anyway, now strikeout works. Thanks a lot for looking into it.
Q: Don’t key combinations in apps normally take precedence over system or browser key combinations that use the same keys?