Remove anchor from readmore link

I use this snippet to create a readmore button on the blog page:

add_filter( 'wp_trim_excerpt', 'tu_excerpt_metabox_more' );
function tu_excerpt_metabox_more( $excerpt ) {
  if ( is_front_page() ) {
    $output = $excerpt;
    return $output;
  }
  else {
    $output = $excerpt;	
    if ( has_excerpt() ) {
      $output = sprintf( '%1$s <p class="read-more-container"><a class="read-more button" href="%2$s">%3$s</a></p>',
      $excerpt, get_permalink(), __( 'Mehr lesen', 'generatepress' ));
    }
    return $output;
  }
}

Now, the standard WP behaviour is to add an anchor to the link like domain.com/post#more-12345

Usually, this can be disabled with this snippet:

function remove_more_jump_link($link) {
	$offset = strpos($link, '#more-');
	if ($offset) {
		$end = strpos($link, '"',$offset);
	}
	if ($end) {
		$link = substr_replace($link, '', $offset, $end-$offset);
	}
	return $link;
}
add_filter('the_content_more_link', 'remove_more_jump_link');

But this does not work in my case. How would I remove this anchor?

Thank you very much!