SUMMARY See title STEPS TO REPRODUCE 0. Use Classic Theme (View -> Message List -> Theme -> Classic) 1. Start up KMail and click on unread message in list (which should set it to read) 2. Right-click this message -> Mark message -> Mark message as unread 3. Click on other message in list and click back on the message which has just been set to unread OBSERVED RESULT Message is viewed in preview window but remains marked as unread EXPECTED RESULT Message is set to read SOFTWARE/OS VERSIONS Linux/KDE Plasma: 5.15.102-1-MANJARO x86_64 GNU/Linux (available in About System) KDE Plasma Version: 5.26.5 KDE Frameworks Version: 5.103.0 Qt Version: 5.15.8