I tried to install icon set calling: "Super flat remix" and got message like below
Downloading "Super flat remix" failed, error SETTINGS invalid number of concurrent streams
The same for different package:
Downloading "Tela-icon-theme" (selected green) failed, error SETTINGS invalid number of concurrent streams
Animation still working.
STEPS TO REPRODUCE
1. System Settings -> Appearance -> Icons -> Get New....
2. Enter "Super flat remix"
error like: SETTINGS invalid number of concurrent streams
icons should be installed
(available in About System)
KDE Plasma Version: 5.25.80
KDE Frameworks Version: 5.96
Qt Version: 5.15.4
Neon unstable, X11
*** This bug has been marked as a duplicate of bug 455540 ***