"Launch Course Builder" doesn't appear with Kadence Blocks plugin

[brianhogg]

Reproduction Steps

1. Install just LifterLMS and the Kadence Blocks plugin (if Elementor is installed the bug doesn't happen)
2. Add a new course

Expected Behavior

The "Launch Course Builder" button appears at the top.

Actual Behavior

The button flashes on and off when hovering over areas of the editor.

Bug.with.Launch.Course.Builder.button.mov

This issue has be recreated:

• Locally
• On a staging site
• On a production website
• With only LifterLMS and a default theme

[brianhogg]

Kadence Blocks adds their button as a div in the div with classes editor-document-tools edit-post-header-toolbar rather than within the div with class editor-document-tools__left. This might be a more reliable spot for it.

[brianhogg]

It does appear and stays when Elementor is installed. Not sure if Elementor is adding some JS or if Kadence sees Elementor is there and doesn't modify the edit-post-header-toolbar div.