Restores the global $post variable in the admin area as some plugins modify it.

patch-admin-page-framework-global-post-variable.php

<?php
/*
    Plugin Name: Patch - Admin Page Framework Global Post Variable
    Description: Restores the global $post variable in the admin area as some plugins modify it.
*/


class Patch_AdminPageFramework_GlobalPostVariable {
   
    public function __construct() {

        if ( ! is_admin() ) {
            return;
        }

        $this->storeGlobalPostVariable();
        
        add_action( 
            'current_screen', 
            array( $this, 'restoreGlobalPostVariable' ),
            1
        );
    
    }
    
    static public $post;
    
    public function storeGlobalPostVariable() {
        global $post;
        self::$post = $post;
    }

    public function restoreGlobalPostVariable() {
        global $post;
        $post = self::$post;        
    }
    
}
new Patch_AdminPageFramework_GlobalPostVariable;