Many non-GNOME applications don't use the symbolic version of icons provided for actions. Unfortunately this theme only provides symbolic action icons. To increase compatibility with these applications, we would need to have non symbolic variations of our existing icons.
Ah, you mean like in toolbars?
Yes.
Related to this, Qt apps are using duplicate icons for "Open", "Save", and "Revert" (possibly others too).
I _think_ this is because Yaru has a document icon but no document-save. When Qt looks for the icon document-save it cant find it so looks for document (again, this is how I think the icon naming spec is supposed to work).
See kid3-qt:

I found a perfect example of this in the Additional Printer Settings dialog (GNOME Settings -> Devices -> Printers -> Additional Printer Settings...)

There is also an upstream issue for this
https://github.com/snwh/suru-icon-theme/issues/82
@ubuntujaggers maybe you find time to help upstream with this rather huge task :)
However would be cool if we could discuss this upstream
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Ah, you mean like in toolbars?