I get a fatal error when I try to add a new page to my site after installing this plugin:
Fatal error: Call to a member function get_page_templates() on a non-object in /path/wp-content/plugins/omit-parent-theme-page-templates/omit-parent-theme-page-templates.php on line 198
I am using Multisite, have not checked it on a normal install.
https://wordpress.org/plugins/omit-parent-theme-page-templates/