The seventh parameter passed to add_submenu_page()

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.

Read more here:: The seventh parameter passed to add_submenu_page()

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