mumble-1.3.4 missing SVG icons in Slackware64-Current (15.0)

Building mumble-1.3.4 for a Slackbuilds.org update, I also tested on 64-but Current and noted a whole host of mssing icons in the menu, themes. It looks like the KDE Frameworks 5 package kiconthemes-5.80.0 broke SVG icon display. Downgrading to kiconthemes-5.79.0 fixes the issue. This seems to effect some other non-KDE5 QT5 application as well. Details:

Missing icons with KDE Frameworks 5.80.0 #4853
Bug 434451 - SVG icons in custom Qt application stopped rendering

Figuring out how to patch this is a bit beyond skill given KDE's build complexity. A comparison between master and v.5.80.0 with numerous fixes, including this one, is here:
https://github.com/KDE/kiconthemes/c....80.0...master