It looks from Instagram API that if you want to display hashtag content based, you can't anymore (because it requires public_content scope).
From official website: This use case is not supported. We do not approve the public_content permission for one-off projects such as displaying hashtag based content on your website. As alternative solution, you can show your own Instagram content, or find a company that offers this type of service (content discover, moderation, and display). You can find more information in the Permission Review documentation.
What does it means company that offers this type of service?
How would you display (in a website) the hashtag content of Instagram nowdays?