While the author of the plugin does not correct this bug, to solve this problem, download my little plugin, install, activate, after go in the page editor, click the Screen Options, enable excerpts. Then, write a excerpt on field that appears at the bottom of the editor. Okay, now “Read More” will call the child page.
Sorry my english … I’m from Brazil. I hope this helps!
Download little Plugin: https://www.oceanovirtual.net/blog/solve-problem
