Greetings
I’m loving your tools…outstanding work.
FWIW I’m also not seeing the UIX Short code Block when the WP Classic Editor plugin is activated. When I disable (using a troubleshooter) or deactivate the Classic editor plugin, the UIX Block appears.
To test, I’ve done a complete disable of all plugins and switched on selectively and I’ve left them all on and switched off selectively. In both cases the results were consistent and repeatable. Classic Editor plugin = missing UIX Short code block.
FWIW, I’m on a fresh install of WP less my plugins:
Auto Upload Images
Version 3.1.1 by Ali Irani
Classic Editor Version 1.3 by WordPress Contributors
Featured Image from URL Version 2.2.6 by Marcel Jacques Machado
Health Check & Troubleshooting Version 1.2.5 by The www.ads-software.com community
Instant Images Version 3.3.0 by Darren Cooney
Jetpack by WordPress.com Version 6.9 by Automattic
Loginizer Version 1.4.1 by Raj Kothari
MailOptin – Lite Version 1.2.12.0 by MailOptin Team
MailPoet 3 (New) Version 3.18.0 by MailPoet
Media Library Categories Version 1.7 by Jeffrey-WP
Members Version 2.1.0 by Justin Tadlock
Uix Shortcodes Version 1.7.5 by UIUX Lab