Multichannel Audio 'plexes from DVD-A going sideways

Hi…thrillled to find this resource.

I’ve been putting my Blu-Ray sourced Atmos/5/1/4.0 versions of classic albums on my server for playback. I was also successful with a few DVD-A titles, until I got to the WB Fleetwood Mac ones, and those are Multiplexing to .MKA as you see attached. The first file has all the data, and the remaining files are useless, although it’s the correct number of tracks.

The output parameters I’m using are identical to the ones I use with BluRays (Split mode: Before Chapters, “all” Chapter numbers, and One chapter per appended file…screenshot attached).

What am I doing wrong? All the FM titles are behaving the same way.

Thank you in advance, and happy to provide any additional context.