Thank you for your explanations, it's now clearer that there are several possible, but not many necessary reasons for multiple VOB ID's per PGC.
Furthermore, it seems that PGCDemux will split either at GiBytes or at VOB ID changes, so if you want a continuous PGC VOB despite several VOB ID's, you may have to use different tools (maybe vStrip). As long as I did not miss a combination of options which can make PGCDemux ignore VOB ID changes.
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