[ContentReferenceList] Content reference to block/media is not kept in the property after exported/imported

Description

Steps to reproduce

1. Add ContentReferenceList as a property of the Standardpage type
2. Go to edit mode, create a new standard page (Page1), then add an existent block/media (Item1) to the ContentReferenceList property
3. Export Page1 with export file option to .episerverdata file

4. Import Page1 from the exported file above to another page node (Page2) (uncheck the option "<label for="FullRegion_MainRegion_UpdateExistingPagesCheckBox">Update existing content items with matching ID</label>")

Expected: Item1 is still in the ContentReferenceList property of Page1 under Page2.

Actual: Page1 is imported under Page2 but Item1 is NOT shown in the ContentReferenceList property.

Note: No problem if Item1 is a page