Created attachment 142274 [details]
Konsole turning black upon hiding its border

SUMMARY
Recently, whenever a window's border is hidden (or restored), the entire window turns black. This started to occur only during the past few months. As can be observed in the attached screen-captures, the window could be reviewed only after performing a minimize/restore or a maximize/restore operation. This observation was made while using KDE in X11.

STEPS TO REPRODUCE
1. Open a window.
2. Hide the window border (either by right-clicking on the title bar or pressing Alt+F3 and selecting "More Actions > No Border"). Window observed to turn black.
3. Minimize and restore the window through its icon on the panel. Window content is visible again.
3.1. Alternately, maximize and restore the window by using the shortcuts Meta+PgUp and Meta+PgDn to make the window content visible again.

4. Now, unhide the window border (by pressing Alt+F3 and deselecting "More Actions > No Border"). Window (except the title bar) turns black again.
5. Repeat either step 3 or 3.1 to make the window content visible again.

OBSERVED RESULT
A visible window turns black upon hiding/unhiding the window's border.

EXPECTED RESULT
Window content should have been visible instead.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE Neon
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION
NVIDIA driver version: 470.74