.net Blazor new debug profile lacks .css .js why? / no CSS / not applied CSS

I have some .net Blazor server-side project that use MudBlazor for frontend.

I needed to add new debug profile for test env. So I did copy default debug profile, renamed id to httpsTest, and changed env variable as on screen:

I created new appsettings called appsettings.TestEnvDevelopment.json

And everything works great except CSS.

When I run this debugTest profile I have no mudblazor / errors CSS as on screen

when I run normal profile, the CSS is OK and everything else also.

So the question is how to handle this properly? What I did forget? What do I need to add?