SUMMARY
If I launch discover, go to settings, and from there go to "Installed", it will crash.

STEPS TO REPRODUCE
1. Launch discover.
2. Go to the "Settings" section.
3. Go to the "Installed" section.

OBSERVED RESULT
Crashes.

EXPECTED RESULT
Should not crash. The crash reported shows this:
Application: Discover (plasma-discover), signal: Segmentation fault

[KCrash Handler]
#4  0x00007fe628542bd8 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/discover/flatpak-backend.so
#5  0x00007fe628548145 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/discover/flatpak-backend.so
#6  0x00007fe628548c9b in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/discover/flatpak-backend.so
#7  0x00007fe69d4be15e in QObject::event(QEvent*) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe69e60c71f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#9  0x00007fe69d491b4a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fe69d494b97 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007fe69d4e9b03 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007fe69bb42cdb in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007fe69bb42f88 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007fe69bb4303f in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007fe69d4e9184 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007fe69d49055b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007fe69d498830 in QCoreApplication::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00005625106edfbf in ?? ()
#19 0x00007fe69ce0c7fd in __libc_start_main (main=0x5625106ed6d0, argc=3, argv=0x7ffd447c7e78, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd447c7e68) at ../csu/libc-start.c:332
#20 0x00005625106ee52a in ?? ()
[Inferior 1 (process 41263) detached]


SOFTWARE/OS VERSIONS
Operating System: Debian GNU/Linux
KDE Plasma Version: 5.24.3
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2
Kernel Version: 5.16.0-5-amd64 (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 2700 Eight-Core Processor
Memory: 15.6 GiB of RAM
Graphics Processor: AMD VEGA10