It was working before as it should be: Clicking on my website url from facebook native app (shared post) redirects to the App store when my native app is not installed. If my native app is installed, it opens the url in my app.
I have all the required meta as well as this one:
<meta property="al:web:should_fallback" content="false" />
Suddenly, redirecting to the app store when my native app is not installed stopped working.
Does Facebook no longer support al:web:should_fallback
meta tag?
Everything was working fine!