Thanks for bringing this up. I asked Helene Whitson of the Bay Area Choral Archive, and she checked on this. She said Grove lists one by Giovanni but not Andrea, and none of the other sources she checked list any 8-part Magnificat by Andreas. I think we can safely categorize it under Giovanni only.
Score error in #650
In m. 46 of #650, the first two notes of the Bass 2 part should be Cs, a third higher than the printed As. #1368 has the right notes (c.f. m. 43). -Noah 13:59, 27 March 2011 (CDT)