HDDVD - Main movie not detected on some discs

[Krobar]

I'm re-ripping some of my HDDVD to fix issues with 256 SPF DD+ Audio. The first time I ripped them was a long time ago with V1.6.X and V1.7.X.

Some of the discs I previously ripped with these old version do load but the main feature is missing from the titles list. I've only tried 6 so far and had this problem with:
King Kong
The Hurricane

Has HDDVD processing taken a step back since these old versions or is it likely disc failure?

[Flesh]

I keep several older versions of MakeMKV specifically for random issues with DVDs & generally the newest for Blueray. It is weird & per dvd it seems, but it is very rare I've had to roll back.

[kroaski4]

I have seen a few discs behave differently between MakeMKV versions too. If an older version still detects the main title, that would suggest it is more likely a compatibility issue than disc failure.