SUMMARY Akonadi does not handle vCal events correctly when there's a specific RECURRENCE-ID;TZID set. I'm using Korganizer & Akonadi with Office365 (EWS) and in vCal events pulled from there there is RECURRENCE-ID;TZID set and if it's set to "Europe/Budapest:20191210T100000" Korganizer and konsolecalendar are not able to show these events at all (konsolecalendar crashes and Korganizer says: org.kde.pim.akonadicalendar: Can't find any incidence with ui XXX even the event with that ID exists: I'm even able examine the event using akonadiconsole). When I manually remove that RECURRENCE-ID;TZID line from vcal event everything works normally. And if I set it to RECURRENCE-ID;TZID=Europe/Budapest:20191210 everything works normally. Only if the line continues with that ...T100000 (Europe/Budapest:20191210T100000) this bug appears. STEPS TO REPRODUCE 1. Create a vCalendar file where is RECURRENCE-ID;TZID with value: Europe/Budapest:20191210T100000 2. Korganizer does not show these events at all and konsolecalendar crashes when trying to show this specific event by using --uid argument EXPECTED RESULT Events should show up in Korganizer and in konsolecalendar normally. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Operating System: openSUSE Leap 15.1 KDE Plasma Version: 5.17.4 KDE Frameworks Version: 5.64.0 Qt Version: 5.13.1 Kernel Version: 4.12.14-lp151.28.36-default OS Type: 64-bit Processors: 4 × AMD Opteron™ Processor 6272 Memory: 5.8 GiB of RAM ADDITIONAL INFORMATION Akonadi version: 19.12.0-lp151.108.1.x86_64 I copied the konsolecalendar crash information here: https://pastebin.com/Mriy6z9s