Smartcrawl returns false-positive recommendation

Smartcrawl returns false-positive recommendation for Robots.txt
“Your meta robots instructions are currently set to forbid search engine bots to crawl your page.”

The meta robots are as follows and do not block the bots

User-agent: *
Disallow:
Sitemap: https://www.domain.com/sitemap.xml

After clearing object cache and site’s cache, and running SEO Checkup, same warning showed back. Also, we tried

User-Agent: *
Allow: /wp-content/uploads/
Disallow: /wp-content/plugins/
Disallow: /wp-admin/
Disallow: /readme.html
Sitemap: https://www.domain.com/sitemap.xml

Please advise