Hi.

PRoblem with Application Dashboard widget.
Plasma 5.9 (although it happend in earlier version 5.
KDE Neon.

Tried to screenshot the problem, but to no avail.
Screenshot shows only gray boxes to indicate it's a transparent background, but doesn't catch 'the problem'.

The only workaround that I found out is when I switch compositor rendering backend to XRender.
All other options (OpenGL 2 & 3.1) renders artifacts (like somekind of small icon enlarged, all pixelated)