I've noticed a slightly annoying issue with GTK3 apps on KDE Plasma - Plasma does not respect change of the inactive window buttons. So for example if you have a GTK3 theme that fades / changes color of the buttons on inactive window it does not work on KDE. Here's a sample:



I've tried the same GTK3 theme (sierra dark solid thin) under Gnome and there it works as expected (window buttons loose color).
Is there anything that can be done to those gtk3 apps windows (some theme tweak etc) so they'll behave correctly on Plasma?

edit : I'm on DE: KDE 5.45.0 / Plasma 5.12.8