How to reproduce:
Go to Party -> Communication -> Search -> select any entry with CommunicationContent -> On the right side under 'Related Content' in the table 'Communication Content' delete any entry
Result: The user gets navigated to EditCommunicationEvent. If I go back to the CommunicationContent the deleted entry still shows.
From my perspective the expected behavior would be to remain on the current view, while the CommunicationContent gets deleted.