How to copy an edited chord symbol?

I’ve edited a chord symbol in Engrave mode to make a chord that Dorico doesn’t normally recognise, however when I try to alt-click it somewhere else I end up with an invisible chord symbol (that you can see is the original starting chord by invoking the popover). How should I be doing this?

I did consider using the engraving option change default appearance, but my understanding is that you can’t create arbitrary new chords with this method? And I can’t change an existing chord because this is a complex project and I don’t want to risk changing something earlier on in the project.

This is a bug, I’m afraid, which we have already fixed in our development builds. It will assuredly be fixed in the next major version when it arrives later in the year. I’m sorry for the inconvenience in the meantime.