Track Ordering Issue with DiscSubtitle

[tiefling]

Until recently, my tracks were ordered according to discnumber.tracknumber with a virtual tracknumber when there was no DiscSubtitle field and by separted track numbers with the DiscSubtitle as a Subheading in between.

I've noticed today that this is no longer the case on any of my controller endpoints (mConnect, Serento, Cambridge Audio) - Whle multi disc albums with no DiscSubtitle are fine, when I have a DiscSubtitle the DiscSubtitle groupings are listed at the top now, and all the tracks muncge together in the wrong order - with all th Track 1's at the top, then all the Track 2's etc.

This is manageable on some control points, but on others, where DiscSubtitle isn't seen at all, it completely messes up the playing order.

This is only an issue in the main views - If you access files via the Folder view it works fine, but that's not an option either in all controllers.

Has anyone else found this and have a solution or has a bug appeared?