Looking to the attached image seems the application has a gradient background by having a footer colour specified different from background colour. This means that the theme autoselection is choosing SuruGradient theme, which is a deprecated one not maintained at all.
So while this gets fixed in the toolkit, apps using gradients as background can force the theme loaded to be the SuruDark by adding the following block to MainView:
Looking to the attached image seems the application has a gradient background by having a footer colour specified different from background colour. This means that the theme autoselection is choosing SuruGradient theme, which is a deprecated one not maintained at all.
So while this gets fixed in the toolkit, apps using gradients as background can force the theme loaded to be the SuruDark by adding the following block to MainView:
Component. onCompleted: Theme.name = "Ubuntu. Components. Themes. SuruDark"