Hello,
Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
I have a feeling that the issue is related the data migration too. You can however fix this issue by resaving the older posts so that Rank Math can generate the new meta for the posts. But this would apply if you do not have so many posts.
Alternatively, you could also edit the database content directly, replacing all references of %post_title% to %title% and %post_excerpt% with %excerpt% in the meta_value column of the wp_postmeta table.
I hope this info helps. Thank you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.