CMMG gen 2 9mm magazine failure

Just bought two brand new Cmmg gen 2 ar conversion magazines to try out, one of the feed lips broke after only ten rounds. Mag no longer holds rounds in properly. Anyone else had this issue?

Rifle was using 5 inch bolt/barrel combo in aero receivers shooting 147gr pmc suppressed.

Inserted a full magazine with the bolt open and this happened, really not sure how. Counted the rounds and it was 33, not overloaded, that’s the advertised capacity.