Closing a window that is beign screencasted (via screencast portal) can change the window that is beign screencasted or crash the program that is capturing the window when hovering a icon in the "Icons-only Task Manager" until the thumbnail is shown 

STEPS TO REPRODUCE
1. Capture a window with OBS (via screencast portal)
2. Close the window while is beign captured
3. Hover the icon of other opened application in the "Icons-only Task Manager" until the thumbnail is shown 

OBSERVED RESULT
The window beign captured changes to the window of the application hovered in the "Icons-only Task Manager"

EXPECTED RESULT
The window beign captured dont change (Only show the last frame of the application closed)

STEPS TO REPRODUCE 2
1. Screencast a window with Firefox (via screencast portal)
2. Close the window while is beign captured
3. Hover the icon of other opened application in the "Icons-only Task Manager" until the thumbnail is shown 

OBSERVED RESULT 2
Firefox crashes

EXPECTED RESULT 2
Firefox doesn't crash (Only show the last frame of the application closed or closing the screencastt)


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro KDE
KDE Plasma Version: 5.24.6
KDE Frameworks Version: 5.96.0
Qt Version: 5.15.5
OBS Version: 28.0.1 (Flatpak)
Firefox version: 103.0.2
Pipewire version: 0.3.56

ADDITIONAL INFORMATION
Someone else successfully replicate the bug in Plasma 5.25.4 on Arch