Well given nobody can get the diamond priest legendary because there’s a 24/25 glitch for the Stormwind rewards… I’d say this release was fairly sloppy by Blizzard… their ‘missing’ section is also bugged/weird, showing cards you’re missing when you have them golden, which creates an issue when you have the above bug for the diamond legend.
This is an old bug. At least I noticed that in Barrens.