www.makemkv.com

Nope, appears the second is indeed the extended.
I just previewed the second mpls after watching it on the player.

The one I'm looking at is not retail, don't believe it has extended on it. The first playlist is numerical order: 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58 and it's exactly the ...

I'm running 1.7.4 and still getting that error - sent the details to mmkv so hopefully they can check it out - apparently new version of encoding?