SUMMARY
Fullscreen windows refuse to render after waking the computer. the window is active and functiona (as i can play/pause a video on zen browser) but the app itself is not visible. this is not an app specific issue as ive had this happen on okular as well. the fix is usually closing and reopening the app 

STEPS TO REPRODUCE
1. open any fullscreen app (in my case zen browser and okular) 
2. let the computer suspend or otherwise sleep for a considerable period of time (5-10 mins)
3. wake the computer or on my case a laptop
{attention: this is not a surefire way to reproduce the bug as the shell responds as intended most of the time. its a hard bug to reproduce but when it happens its very annoying}
 
OBSERVED RESULT
After the unlocking prompt user will be greeted by their wallpaper instead of the previously fullscreened app. the app itself is running and is the active window as suggested by the icons only task manager but the window itself is completely transparent/ refusing to render in the shell. 

EXPECTED RESULT
the user should be greeted by their previously fullscreened app instead of their wallpaper and expect to pick up where they left off

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: linux 6.17.5-arch1-1
KDE Plasma Version: 6.5.0
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0

ADDITIONAL INFORMATION
Device : Thinkpad T480 
Gpu : Mesa intel uhd 620
cpu : intel core i5-8350u
display server : Wayland