Reference List Metabox Missing after update

[georgemanea1987]

ABT Version: 5.2.2

PHP Version: 7.3

Theme: Newspaper 10

Plugin List:

• Advanced Editor Tools
• Akismet Anti-Spam
• All in One SEO
• AMP
• Asset Queue Manager
• Better Image Credits
• Better Notifications for WP
• Category Checklist Tree
• Classic Editor
• Envato Market
• Favicon by RealFaviconGenerator
• FG Fix Serialized Strings
• Lazy Load - Optimize Images
• Post Category Filter
• Reduce Bounce Rate
• Search by ID
• Selection Sharer
• Simply Show Hooks
• Slider Revolution
• Smush
• Swifty Bar, sticky bar by WPGens
• WP Options Importer

Browser: Mozilla Firefox (Version: 86.0)

Expected behavior: I expected to see the metabox with the reference list

Actual behavior: But the metabox is not visible anymore, not even as an option in the Screen Options. This is after i updated to 5.2.2. It should appear on the right sidebar.

Console messages:

// no errors