I looked at it with MediaInfo and I see the same thing. (Forgot I had that app!)
Do you think the 7.1 file is derived and created by MakeMKV? A few other people are suggesting that. Not directly suggesting in so many words, but implying.
The tech I've read states that a 7.1 core comes as delivered. It's the height and object channels that scale to fewer channels for anyone without the full height and object array.
The Atmos codec reads the available output channels and scales accordingly. For the example of a 7.1 system with no height or object channels, the media player is to fold the height and objects into the available 7.1 array as well as possible. Not actually create and write a new 7.1 file!
Actually deriving and writing a unique file by a ripping app is really a stretch I think. Nothing else works this way and none of the documentation agrees. (And how would hardware players do such a thing, right?)
I think the 7.1 core as available to any of us (Atmos codec having or not) is as delivered. The fact that the "mastering" matches the other "mastered" streams in sonic character and channel level profile can only mean it's intentional and as delivered. The premise that the 7.1 file is derived and created on the fly, and this will happen incorrectly when MakeMKV doesn't see a media player with the Atmos codec in the system, and that result could match the sonic and level character of the other "mastered" streams exactly has to be fully impossible.
I'm beating a dead horse I suppose. But I don't want to dismiss anyone's premise outright without explanation. So, there it is. If the interest is in actually hearing the mix as intended and not just settling for sounds coming from multiple speakers loudly... Like I said, I was trying not to assume that or just be dismissive.
Is my premise about the 7.1 core of the Atmos mix incorrect?
I'm going to suggest that even if the 7.1 is derived on the fly, then it followed "mastered" program and used that data to create the file. Again, there's more alteration than just levels or peak limiting and the sonic character of the "mastering" is in the 7.1 Atmos core file.
Now I have to wonder if the customer (Yoko?) requested this though! After reading all the reviewers that seem to like the spanked version. Maybe the client did as well and it was requested. We might very well see a corrected reissue with the dd stream getting the "mastered" mix instead of the other way around! That feels like a stretch to me but obviously others listening to this have different opinions. And it seems reasonable to blame Yoko I suppose.
No longer any response from the horse...