There seem to be some issues around the DOI when interacting with preview and save.

To reproduce an issue:
1- Go to deposit form and fill in the mandatory data.
2- Save and preview the record without doing any change to the DOI
3- Go back and click "No, I need one" -> "Get a DOI now!"
4- Hit the preview again and see how the DOI is correclty displayed.
5- Go back by hitting the back button on the BROWSER (seems that hitting Back to edit works fine) and notice how the DOI is not selected anymore, at this point if we preview again it will not display. If we try to add it to again it will fail with the error shown in the screenshot below.

Seems that locally is not possible to reproduce ...