and we've had P85D where the ludicrous flag isn't always set a
That's not a valid comparison because that was an option 100% added to those cars after delivery, and only sometimes did the SERVICE CENTER go back and add the BP01 code to the car's option code list. What we're talking about here are new cars that have never left the factory having inconsistent option coding.
Unless you have been told by Tesla the definitions of the codes, you're just trying to work out a pattern to make them fit, just because you've not fully cracked the pattern it doesn't mean there isn't one.
Yes, Tesla publishes the codes and their meanings and descriptions in several places and data streams. There's no pattern to "crack" -- the usage was simple: Option Code==Option on the car's listing page. That's how option codes work for Tesla and every other car manufacture out there. This is the first example of where that's not the case, and Tesla is doing some black-box post-processing on the option codes to actually mean different things when people buy the cars. So yes, this is 100% an inconsistency on Tesla's end.