I, too, am getting the double-display of the “Read The Post” after upgrading from 1.29.00 to 1.30.3. I get the general one from the theme, and then one from the child-theme that we created with this post: https://www.ads-software.com/support/topic/changing-read-the-post?replies=5
I’m not using the above mentioned plugin, and to verify that it wasn’t actually plug-in related, I disabled EVERY plugin and still am getting this issue. I know I could simply edit the parent-theme but shouldn’t have to as the point of child-themes is to avoid having to edit on each upgrade.