Bug 512253

Note: the version of kontact on my system doesn't seem to match the list of versions in the version field. This is what I find in the rpm package info:
Name        : kontact
Version     : 25.08.3
Release     : 1.fc43
Architecture: x86_64

SUMMARY
I have just upgraded to Fedora 43. In previous editions I have not been able to use plasma on wayland. A few core applications failed to work. So with Fedora 43 installed I'm re-evaluating.

This bug is about a failed attempt to use the kontact application. If I try to start it, it won't crash, but won't display a window either, only a task on the taskbar suggests it's running.

STEPS TO REPRODUCE
1. Open a terminal
2. Execute 'kontact'

OBSERVED RESULT
There is a taks on the task bar named "Kontact", but no window appears. The terminal in which I ran the "kontact" command has the following output:

$ kontact
GBM is not supported with the current configuration. Fallback to Vulkan rendering in Chromium.
org.kde.pim.pimcommonactivities: Plasma activities is not running:  1
qt.core.qobject.connect: QObject::connect(QIODevice, Unknown): invalid nullptr parameter
qt.core.qobject.connect: QObject::connect(QIODevice, Unknown): invalid nullptr parameter
qt.core.qobject.connect: QObject::connect(QIODevice, Unknown): invalid nullptr parameter
qt.core.qobject.connect: QObject::connect(QIODevice, Unknown): invalid nullptr parameter
qt.core.qobject.connect: QObject::connect(QIODevice, Unknown): invalid nullptr parameter
qt.core.qobject.connect: QObject::connect(QIODevice, Unknown): invalid nullptr parameter
qt.core.qobject.connect: QObject::connect(QIODevice, Unknown): invalid nullptr parameter
qt.svg.draw: The requested buffer size is too big, ignoring
qt.qpa.wayland: eglSwapBuffers failed with 0x300d, surface: 0x55e183c56ed0
qt.qpa.wayland: eglSwapBuffers failed with 0x300d, surface: 0x55e183c56ed0
org.kde.pim.mailtransport: We have an error during reading password for 1396373894 "Entry not found"
^CShutting down...
kf.xmlgui: 0x55e183ab2e70 deleted without having been removed from the factory first. This will leak standalone popupmenus and could lead to crashes.
qt.core.qobject.connect: QObject::connect(QIODevice, Unknown): invalid nullptr parameter
kf.xmlgui: 0x55e183aa7c88 deleted without having been removed from the factory first. This will leak standalone popupmenus and could lead to crashes.
kf.xmlgui: 0x55e183993b40 deleted without having been removed from the factory first. This will leak standalone popupmenus and could lead to crashes.
kf.xmlgui: 0x55e183aa88d8 deleted without having been removed from the factory first. This will leak standalone popupmenus and could lead to crashes.
kf.xmlgui: 0x55e183a966c8 deleted without having been removed from the factory first. This will leak standalone popupmenus and could lead to crashes.
kf.xmlgui: 0x55e183a9c3a8 deleted without having been removed from the factory first. This will leak standalone popupmenus and could lead to crashes.
kf.xmlgui: 0x55e183a9ea48 deleted without having been removed from the factory first. This will leak standalone popupmenus and could lead to crashes.
kf.xmlgui: 0x55e1839f3228 deleted without having been removed from the factory first. This will leak standalone popupmenus and could lead to crashes.

While I leave kontact running in this state, I'm not able to launch other applications. They will all end up with just a task in the taskbar and no windows will appear. When I kill the kontact command in the terminal, other applications will start normally again. I have tried with digikam specifically.

EXPECTED RESULT
Kontact should just run normally.

SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 43
KDE Plasma Version: 6.5.2
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0
Kernel Version: 6.17.7-300.fc43.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-6700K CPU @ 4.00GHz
Memory: 48 GiB of RAM (47.0 GiB usable)
Graphics Processor: NVIDIA GeForce GT 1030

ADDITIONAL INFORMATION