Dark mode reverts when opening an app

Dark mode in the Windows guest will revert once you open an app.

This happens if you change the setting via virt-manager, and it also happens when using the "Windows" shortcut to get a full FreeRDP desktop session, and change the setting from there. The setting will revert and the app will open up in light mode.

To reproduce:

1. Sign in to the guest through virt-manager or FreeRDP
2. Go to Settings > Personalization and set the color scheme to dark
3. Open File Explorer to see that the color scheme has been changed to dark
4. Log out/reboot the guest.
5. Open up the File Explorer shortcut from the Linux host
6. File Explorer has reverted back to the default light mode (blindingly so)

I'm on KDE neon 6.0 user edition.