I was just reading the commentary at the end of Duck Luck, vol 27 of the Complete Carl Barks Disney Library, and I note that Roberta Gregory, the daughter of creator Bob Gregory, says, "Although he wrote many Daisy Duck stories, I can firmly attest that Bob Gregory was not responsible for any of the stories in this volume [CBL 27, which includes the stories from OS 1150]." The Duck Luck table of contents lists the author of the stories from this issue as "unknown." So I went to INDUCKS, and found that Bob Gregory is still listed as the writer of the stories in OS 1150. Should that be changed? Roberta Gregory reports that she has documentary evidence ("remittance advices" from Western) as well as the comics she annotated with her father when she was a child. She sent the documents to the Grand Comics Database, and there indeed the scripts of the stories in this issue are credited to "?".
If she only contacted the GCD with these documents, it shouldn't be that surprising Inducks hasn't been updated with this information. Different databases usually aren't entirely up to date on each others' new discoveries.