I get the impression it’s all Amadeus based airlines that are having issues with Seatmaps. AY for example also doesn’t work, plus there are already reported issues with BA and LH.
Amadeus has a set of APIs that are available - to make it truly an expert tool, perhaps they could implement additional GDS access for an additional tier on top? Say connections to not only Sabre, but also Amadeus and or Galilieo?