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OK, based on those graphics I have discovered a bug with the TSA attachments. The TSA attachments are those for the MMU Flight Support Stations(MMU FSS) attachments, not for the TSAs on the airlock truss. If I remember right, only Challenger and Discovery ever received the modifications necessary for the MMU FSS. The Challenger accident happened before Columbia and Atlantis was modified to support them. And naturally, the MMU was retired long before Endeavour flew for the first time.
No bug, but a feature - for keeping the number of attachments "low", we decided to use the MMU attachments for the TSA, by just changing the position and orientation. External Airlock and MMU together did not happen together in history AFAIR.