Created attachment 133698 [details]
Improperly displayed image after following the steps

SUMMARY
Images are improperly stitched after zooming in and moving around.

STEPS TO REPRODUCE
1. Open an image
2. Zoom in on the image
3. Move across the image in any direction while continually holding down the mouse.
4. Then move back and observe the image wrongly stitched together where it was hidden from view.

OBSERVED RESULT
The image is poorly stitched where it was hidden from view.

EXPECTED RESULT
The image should be properly stitched after zooming and moving around.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: KDE neon 5.20
(available in About System)
KDE Plasma Version: 5.20.3
KDE Frameworks Version: 5.76.0
Qt Version: 5.15.1

ADDITIONAL INFORMATION
GPU: GTX 1080 Ti
Driver: nouveau NV132 20.0.8
Display native size: 3840x2160
Global scale: 150%
Mesa: 20.0.8

Compositor (not sure if relevant):
Scale method: Smooth
Rendering backend: OpenGL 3.1
Tearing prevention: Automatic
Allow applications to block compositing: false.
/etc/profile.d/kwin.sh: KWIN_TRIPLE_BUFFER=1