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[Moin]

The problem is the recently added variable for the background color on topics you have read.

I don’t think there is a dev-news about this change. But you can find some information here:

Styling Discourse with variables: Show & Tell

We’ve recently added a lot of css variables to Discourse. These variables make theming and customizing aspects of the UI much easier. For many changes, you will no longer need to target super specific elements in the html, and instead only change a variable. If you are curious about what variables are able to be changed, I suggest you look through the app using this regex → --([a-zA-Z0-9\-_]+): If using a code editor and searching for all instances of the above regex, you should see something …