Update: Just to let you know that I have updated to Oxygen 4.2 and OxyProps 1.4.9 and the issue is still there. I should have added that all unrelated plugins have been deactivated, but the problem persists.

After updating from 1.3.7 to v1.4.4 (WP v6.03, Oxygen v4.04), most, if not all, of my CSS settings are not showing the colours they should be. All of my backgrounds, background gradients, overlays, and border colours have reverted to the surface colours or black/white, e.g. var(--o-user-links-5) and var(--o-user-links-9) show as the same surface colour, when they should be a variant of green. The OP Custom Palette is all one shade of grey, as is the OP colour palette. The OxyProps settings show the correct colour settings.