Don't see added content on Floating editor after moving it from custom content provider to default content provider

Description

Steps to reproduce:

1. Create standard page A > publish page A.
2. Under entry point of content provider, create page B.
3. Drag and drop page B into the content area of Page A. Don't publish page A.
4. Move page B from content provider to a normal tree.
5. Refresh page A.
6. Open the Floating Editor of the content area on Page A

Expected: Page B should be visible in both the overlay and floating editor for the content area on Page A.
Actual: Page B is visible in the overlay for the content area on Page A, but it is not visible in the floating editor.