How to get excerpt correctly formatted

wp_trim_excerpt() calls wp_trim_words() which applies wp_strip_all_tags() to the excerpt. The <br> tag is removed and not replaced with anything.

Not sure if this is feasible, but having a space after a colon is grammatically correct, and adding it to the original content would not affect the HTML, e.g.:

<p>My new question is: <br>why words are not separated by a white space?</p>

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