Hey there! Is this still a problem for you? If yes then which editor are you using?

I have the same problem. I have an article about a city, and have colour coded the text for each district (not the prettiest but makes things very clear for my players). I access editing this article through the dashboard > articles and world manager > (the article itself). When is the same editor I click the "go to view mode" eye icon and it loses all colour.

I have the article linked to a pin on a map, and if I follow the pin it instead loses most colour. Regular text has colour but the text formatted as headings dont (when they do in the editor. I know heading 4 is not coloured but I am mostly using heading 5 to header specific locations and shops in the city and they are mostly what I want to use the colour coding for, but they lose colour here too.

I am starting to think this is intentional design. That said it would be nice if the editor more closely reflects what the players see as I have no idea what version they are getting at this point. View mode, edit mode, and linked article (in-world) versions of the same article all look different. If the headers cant be coloured then remove the option to do so in the editor, it is misleading. Or give us the ability to change the colour of headers that we already have in the editor and have that actually carry over to the in-world article.