The "Adding" or "Duplicating" notification is replaced by our standard "Studio is having trouble saving your work" message at the bottom. I don't add the component into the unit, under the assumption that the error meant the creation or duplication did not work.

In reality, it is possible that the creation or duplication did work, and the error occurred after that. If that is the case, refreshing the page (which we recommend in the error message) will show the component.

The code as previously written always assumed that the operation was successful-- the component was added to the page immediately, and the analytics tracking message was created, both before we even heard back from the server.