Auto confirm is not enabled in UDW for Embed block.

Steps:

1. Create / edit Landing Page.
2. Add Embed block.
3. In Settings click Select content.
4. In UDW choose parent and click "+".
5. Select content type and click Create.
6. Fill mandatory fields and click Confirm.

Actual: UDW remains open, parent from step 4 is selected and added to block when user closes UDW / confirms.
Expected: UDW is closed (since there is no multiple selection), newly created item is added to block.

Remarks: Also in this situation UDW displays information that 2 items are selected (see attached).