Adding a custom query_vars

I am trying to add a custom_vars to my wordpress site using version 6.5.3 (Hebrew)

The template is Twenty Twenty, and I disabled all the plugins.

The problem is that after adding the query_vars, access the site with http://localhost?city=whatever returns the posts page.
Accessing the site normally without the query_vars (http://localhost) returns the statis page as expected.

This is the code that I added to wp-content/themes/twentytwenty/functions.php:

function myplugin_register_query_vars( $vars ) {
	$vars[] = 'city';
	return $vars;
}
add_filter( 'query_vars', 'myplugin_register_query_vars' );


function myplugin_rewrite_tag_rule() {
	add_rewrite_tag( '%city%', '([^&]+)' );
	add_rewrite_rule( '^city/([^/]*)/?', 'index.php?city=$matches[1]','top' );
	
}
add_action('init', 'myplugin_rewrite_tag_rule', 10, 0);


function myplugin_pre_get_posts( $query ) {
	if ( is_admin() || ! $query->is_main_query() ){
		return;
	}


	$city = get_query_var( 'city' );

	// add meta_query elements
	if( !empty( $city ) ){
		$query->set( 'meta_key', 'city' );
		$query->set( 'meta_value', $city );
		$query->set( 'meta_compare', 'LIKE' );
	}

}
add_action( 'pre_get_posts', 'myplugin_pre_get_posts', 1 );