I use Strawberry too, because it’s a Qt app and it integrates very well with my Plasma desktop, and because it supports Subsonic/*sonic protocol/API (I’m using Gonic as my *sonic server).
And I was able to achieve quite nice look/color-scheme with my Strawberry, so it looks very good on my desktop too 👍
I think this was fixed on Plasma 5.27.x onwards. There was major rewrite of display configuration handling, that fixed these issued for me at least.