https://www.discjapan.com/product/queen-the-open-air-festival-1986-2cd-with-obi-strip-shakuntala-stcd-173-174/

Could this be the Pre-FM reel that emerged earlier this month on ebay?

www.ebay.co.uk/itm/QUEEN-1986-NPR-DNR-Pre-Fm-Germany-EXCELLENT-REEL-TO-REEL-TAPES/254249049257