GTK+ 3 CSD is white, doesn't include any colors.

I noticed that ever application I use with GTK client-side decorations has white window decorations, omitting most of the Breeze theme. I did test other programs, and they had the same issue. I don't think this is intended behavior.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: breeze-gtk-theme 5.13.4-1ubuntu1
ProcVersionSignature: Ubuntu 4.17.0-9.10-generic 4.17.17
Uname: Linux 4.17.0-9-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.10-0ubuntu9
Architecture: amd64
CurrentDesktop: KDE
Date: Thu Sep 6 16:00:05 2018
InstallationDate: Installed on 2018-09-05 (0 days ago)
InstallationMedia: Kubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180905)
SourcePackage: breeze-gtk
UpgradeStatus: No upgrade log present (probably fresh install)