CSS Style not applying in Designer for Inherited Projects

I have a project inheriting from another Master Template project.

I created a custom theme (new-light) that begins with the light theme and just defines some company colors. I am setting the session theme to be this new theme at startup. In the designer, when I open the Master Template project, I see all the colors defined in this new theme correctly applied in the screen; but in the inherited project, I do not.

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Have you confirmed that the session theme is actually your custom one in the client? Does it work in the designer?

If you open dev tools in the client, can you see your custom theme styling in there? Are they in there but crossed out?