I'm testing WordPress 5.3 (5.3-RC4-46673) with my theme. I have
WP_DEBUG enabled. I notice the following error in the dashboard now:
Notice: add_submenu_page was called incorrectly. The seventh parameter passed to add_submenu_page() should be an integer representing menu position. Please see Debugging in WordPress for more information. (This message was added in version 5.3.0.) in /app/wp-includes/functions.php on line 4903
There's a related ticket for this error here: Trac Ticket #48249
Troubleshooting The theme I'm using is a child theme.
- Disabled all plugins, issue persists.
- Issue happens with child them active and parent theme active.
- Issue goes away with twentynineteen.
So it's definitely within the theme. Just not sure how to go about tracking this down.