WebP .htaccess files in wrong position causes problems with uploads-redirects

mu-plugin-migrate-webp-express-htaccess.php

<?php

function migrate_webp_express_htaccess_files() {
	$extra = [];

	$uploads = wp_upload_dir();
	$uploads = $uploads['basedir'];
	$themes = WP_CONTENT_DIR .'/themes';
	$plugins = WP_CONTENT_DIR .'/plugins';

	$uploads_rel = str_replace(trailingslashit( ABSPATH ), '', $uploads);
	$themes_rel = str_replace(trailingslashit( ABSPATH ), '', $themes);
	$plugins_rel = str_replace(trailingslashit( ABSPATH ), '', $plugins);


	foreach ([ 
		$uploads => [ 'RewriteRule ^/?' => 'RewriteRule ^'. $uploads_rel .'/' ], 
		$themes => [ 'RewriteRule ^/?' => 'RewriteRule ^'. $themes_rel .'/' ], 
		$plugins => [ 'RewriteRule ^/?' => 'RewriteRule ^'. $plugins_rel .'/' ],
	] as $dir => $patch) {
		$file = $dir .'/.htaccess';
		if (is_file($file)) {
			@rename($file, $file. ".migrated");
		}
		$file = $file. ".migrated";
		if (is_file($file)) {
			if ( ! function_exists( 'extract_from_markers' ) ) {
				require ABSPATH . 'wp-admin/includes/misc.php';
			}

			$rules = extract_from_markers( $file, 'WebP Express' );
			if ($rules) {
				$extra[] = "# Migrated from: " . (str_replace(".migrated", '', $file));
				$rules = implode("\n", $rules);
				$extra[] = strtr($rules, $patch);
			}
		}
	}

	return $extra;
}

add_filter('rewrite_rules', function( $input ) {
  $extra = migrate_webp_express_htaccess_files();
  return implode("\n", $extra) . "\n". $input;
});