Huh, so I finally got around to pairing the card with my car (Ioniq 5 Limited) and ran another Full Taginfo. Running a compare in Notepad++ showed me no change (except for the scan date at the top).
It took almost no time to add, so I suspect it’s not installing anything, just registering existing info on the card. Is it possible they’re installing a Javacard app and/or private key on these from the factory instead of at pairing-time? When I messed around with my Fidesmo card in the past, I recall it taking a while to install an app and I think it changed its Taginfo behavior?