SUMMARY On some unread emails (I am still trying to figure out which ones), pressing Ctrl+R reports the "Ambiguous shortcut detected" popup. But when opening the shortcuts menu, there's only one that has this shortcut assigned to: the "mark as unread" action, which is the one I wanted to use. STEPS TO REPRODUCE 1. Use Ctrl+R on an unread message to mark it as read. OBSERVED RESULT Kmail reports an Ambiguous shortcut detected popup and does nothing. EXPECTED RESULT The message is marked as read. SOFTWARE/OS VERSIONS Operating System: Fedora Linux 43 KDE Plasma Version: 6.5.1 KDE Frameworks Version: 6.19.0 Qt Version: 6.10.0 Kernel Version: 6.17.5-300.fc43.x86_64 (64-bit) Graphics Platform: Wayland Processors: 8 × 11th Gen Intel® Core™ i5-1145G7 @ 2.60GHz Memory: 16 GiB of RAM (15.3 GiB usable) Graphics Processor: Intel® Iris® Xe Graphics ADDITIONAL INFORMATION The keyboard layout I'm using is the "German, Swedish and Finnish (US)" one.