Most of my References/Relations will allow you to double click quite happily and pass the value back to the card.
Others will allow you to double click but the value isn’t passed back to the card.
These ones, from time to time will also ignore a double click.
Clicking on the Tick and then Save works fine however.
I am running 3.3.0 via the latest version of Google Chrome and cleared the browser cache.
Is there anything that can cause this behaviour?