Structured Data and SEO Title Issue

My site runs on AMP entirely (Standard Mode) and I think I’m having a couple of issues because of that.

• When testing a post page (which is an AMP page) in Google’s Rich Results Test tool, I get a Missing field ‘headline’ error. The Rank Math AMP module is enabled. And I cleared full cache multiple times. Even tried without cache. It doesn’t help.

  Example test URL: https://search.google.com/test/rich-results?url=https%3A%2F%2Fwhatemoji.org%2Fwoozy-face%2F&user_agent=1

• I have modified the Single Post Title in the plugin setting like this “%title% Emoji %sep% %sitename%”. I need the ‘Emoji’ word after the post title in the SEO title for all posts. However, the SEO title under the <title> tag in the HTML remains the same as the default pattern only “%title% %sep% %sitename%”. It’s disregarding my custom setting. Also, I’m NOT setting (modifying) the SEO title on individual post pages. I understand that’d override the global setting.

It’d be very helpful if you could resolve these issues. I tried Yoast, these issues weren’t present on their plugin. But Yoast messed up all emojis on my site by failing to render emojis and instead showed unsupported unicode characters.