What you wrote confuses me and I've set up a lot of systems. Anyhow I have to write "go with what works."
My thought is the HDMI port 2 or the one that has ARC or Samsung's version there of is connected and that may be in play here.
Research HDMI ARC and CeC as well as Samung's own ARC/CeC system. Too bad seller and Samsung are not talking here but you're right it's not something I've seen unless it's on the ARC CeC port. Then again, I don't have your rig and don't recall seeing this exact issue.
Again, I'd go with what works.
Has anyone connected an optical cable to the connect Mini and then to a receiver? After doing so when I go into my speaker list on the television in the sound menu to choose audio optical out no sound comes out of the receiver speakers but if u choose reciever HDMI it works. I contacted Samsung they are telling me to choose audio Optical out as well. But I get no sound that way. When I choose receiver HDMI sound comes out of all my speakers. This seems backwards to me and Samsung as well. I have even proven the optical cable is delivering the sound out of the connect mini to the receiver by unplugging it and at that point I get no sound. I'm not sure if the firmware or GUI is screwed up in the Samsung menu or what is going on. Anyone else notice this issue?