Bad dark theming

Well the image says more than a thousand words. I am on KDE 5.20, Arch Linux and I have dark theming set for both QT and GTK apps...
Is there any workaround for this for now? I thought on unseting theme variables but I am not sure which one.
Thanks for the report!
Other users have noticed this issue, and it may not be a theming issue but rather a font issue. Just to confirm, are you able to validate that the other buttons are showing up in light theme ?
Not sure which env variables to set but using settings fro both KDE global theme and gtk's didn't change nothing.
So probably not related to theming as I thought. That's fonts related?
It may be a mix of theming and fonts. By the screenshot, Uno is detecting that GTK requested for dark theme, but it seems that it's not applying properly. That's some interesting cues 👍
What font should it work with? I could test