Cloudflare WAF blocking Admin.Ajax and post.php?

What is the name of the domain?

mcnews.com.au

What is the issue you’re encountering

Can’t save posts in Wordpress due to Admin Ajax.php and Post.php being blocked by cloudflare

What steps have you taken to resolve the issue?

I have added two rules in the Cloudflare WAF to exempt Admin.Ajax.php and Post.php but am still having the issues. The only way I mitigate is put Cloudlfare onto development mode.

What are the steps to reproduce the issue?

If there are too many tables (made by TinyMCE) in my WordPress Draft I can not save the draft. If I reduce the number of tables it is possible to save or publish.