If modify project name of blazor app, scope string in bundled css didn't matched in html tag.

As far as I know, CSS isolation occurs at build time. During this process, Blazor rewrites CSS selectors to match markup rendered by the component. These rewritten CSS styles are bundled and produced as a static asset at {PROJECT NAME}.styles.css, where the placeholder {PROJECT NAME} is the referenced package or product name.

If you modify the project name, you should also modify the index.html css reference as below:

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Hi, you have to clean project after rename. Delete bin and obj folders will help.