I virtually always disable linked styles. They cause problems, IMO.

You would apply a heading style to selected text if you wanted the same formatting. My advice would be to instead create a character style that matches it. This avoids confusion.
The built-in-heading styles when used as paragraph styles have special qualities which are not present when they are used as character styles.
Why use Microsoft Word’s built-in heading styles? by Shauna Kelly

If you would like instruction on how to set up some matching character styles, let me know.