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I ran the Apple Guided BCT (Bonjour Conformance Test) program on a MacBook Air (13-inch, Early 2015 / Catalina).The result is Failed in INITIAL PROBING.I clearly confirmed that it works from Mac OS and Windows 10 to printing through Bonjour.We confirmed that it works from iPhone to AirPrint.Apple's Open Source cups and mdnsd (mDNSResponder-878.270.2) do not think it will fail.