Goodreads Librarians Group discussion

I had an author add his new books & leaving the ISBN blank (he did put in an ASIN) and now neither he as the author with a verified account, nor me as a librarian can add the ISBN to the book.

I found no information in the group, other than the fact that superlibrarians also cannot edit an ISBN. But we are not trying to edit, just to add one.

To clarify, I am not looking for anyone to edit his book for me, I just want to understand why he/I cannot do it. Is it a bug? Is it a feature where even blank isbn fields cannot be edited? And if so, how would one approach/fix this?

Thank you in advance!

Once something has been entered in any of those fields the others are blocked and nothing further can be added by author or librarians, only staff can edit that.
I don't know why they don't trust librarians to enter this but it is annoying. Thankfully not as frequent a problem as images set by staff which we cannot change.