Before: {F6568854}
After: {F6568855}
Before (Breeze Dark, no //Background contrast effect//): {F6569235}
After (Breeze Dark, no //Background contrast effect//): {F6569236}
Using the Background Contrast Kwin effect adds a weird dark background to all the dialogs and the corners aren't rounded anymore:
{F6568856} and these strange dots appear instead (a rectangle bleeding through?)
{F6568352}