[ContentProvider] Warning message is displayed when moving pages between two XML Content Providers Cut/Paste commands

Steps to reproduce

Steps to reproduce:

1. Configure and create pages for 2 Custom Content Providers (called Provider1 & Provider2) (refer to the attachment to know how to create more than one Content Provider for the site). 

2. Capabilities of moving pages are enabled for both 2 Content Providers.

3. Navigate to Admin mode -> Config -> Security -> Permissions for Functions: Configure to set access right for logon user on the function "Allow users to move data/pages between page providers".

4. Navigate to Edit mode.

5. Select source page under Provider1 then click Cut command.

6. Select destination page under Provider2 then click Paste command.

7. Confirmation message "Do you want to move this page?" is displayed. Click OK button on this -> An unexpected message is displayed "Content with id 2__XmlContentProvider2 was not found" (NG).

8. Refresh the site then see the page is moved successfully.

Expected result:

- Warning message should not be displayed in step 7.

- The page should be moved immediately without refreshing the site (Move page within one Content Provider works fine this case).