Hello @brian_t_anders ...
If I understand your question correctly, you have a situation where an instructor had a course that utilized Google Cloud Assignments, and then that course was shared to Commons. Then, another instructor import the course from Commons into his/her own course. You mentioned that the document from the originating course were all set to "public" in the first instructor's Google account. This is just a wild guess, but do you know if these documents in Google are stored in a folder? If so, is that folder also "public"? It may be possible that the documents in a folder are "public", but the folder itself is not public. I've not tested this at all on my end, and I could be completely wrong in my theory (wouldn't be the first time), but it's something to maybe investigate on your end.
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