Please, for the love of god, don't fix the cosmetic glitches
The only reason why I even buy some of these linked sets and legendaries is to combine them with other outfits, that's only possible via bugs. By fixing said bugs you remove any incentive of ever buying linked sets again. Don't do this.
I know that you probably have some duties to various license holders but you still can pretend that these issues are beyond your responsibility since those would be bugs and not actual ingame-features.
EDIT / UPDATE (06/29/21):
https://twitter.com/edgy2000scheryl/status/1409951067106906114
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Answer: $$$$
While I would love nothing more than them to unlink Cheryl's cosmetics, I am not... entirely certain that email asked the correct question, or the response seemed to indicate that they understood this particular matter. The question asked was 'please make more content for Cheryl' and the answer given was 'we can't do that, it's not our game.' The question needed to be 'hey, do you guys actually care if Cheryl's cosmetics in this other game are allowed to be mixed? Was that a condition of your agreement?'