ADDON VERSION: (place version of the addon you have installed here)
Dragonflight v63

Describe the bug
Not sure if this change happened after the introduction of warband transmog collecting, but many rares in the Dragon Isles can now drop gear that your class cannot equip, allowing you to collect their appearance for your account/warband. The tooltip however, still uses the term "Unobtainable". I cannot confirm if this is true for all Dragon Isles rares or just the ones in Zaralek Caverns.

This also has the additional effect of hiding a rare's skull from the map when you have only collected the appearances your class can use. If the rare has additional unlearned appearances that you class cannot use, it will be hidden if the option "Hide rare if all rewards known" is checked.

As an example, my demon hunter was able to get Subterrax's Stout Waistguard and Magmascale Pauldrons to drop, despite both of these items being mail and not leather.
I also attached a screenshot of what the tooltip currently looks like.

Screenshots

Going to close this for now. We investigated this bit and have decided to keep trusting the table of specs a piece can drop for because it still seems to be correct most of the time. If this causes problems we can re-evaluate.

I would rather something say it is unobtainable but actually can drop than have it say it can drop and waste someones time farming a piece their class cannot obtain, if that makes sense.