UPDATE:
It seems the error is when I add the excert on the related post block.
If I just use image and tittle seems to work
Hello,
Thank you for contacting Rank Math today.
I just found today that RM has a block to related content.
HowTo, FAQ, and Schema Markup are the only 3 blocks with Rank Math plugin adds in the block editor. Maybe some other plugin active on your site is adding the Related Content Block?
I hope that helps. Thank you.
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This reply was modified 4 years, 9 months ago by
Pratik.
I don’t have any other plugin.
But as I said, the block is working, only shows a JSON issue if I add the excert to the related content to be shown.
You can see here:
https://thebinaryoptionsblog.com/iq-option-login-and-download-how-to/
Hello,
That is weird, since as my colleague said, we don’t have any other block. Is it under the Rank Math section blocks, like in the screenshot?

Looking forward to help you.
Hi,
Forget, it is a regular block from WP and not from RM.
Sorry.
Hello,
We are super happy that this resolved your issue. If you have any other questions in the future, know that we are here to help you.
If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.
If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.