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Mastercrafted Ursine gear bug?

I’ve got all the diagrams for the Ursine gear except the Mastercrafted ones, I’ve gone to the blacksmith or Armorer in Skellige but the Mastercrafted diagrams don’t show ?? And I’ve gone to the location of the gear to see if I missed them somehow but the chest isn’t glowing ? Is this another bug ? Just like wolven gear can I not go further than this ?
I don't know if you ran into a bug. In general, there are several locations where you can find pieces of the mastercrafted diagrams. The internet is full of guides where to find them.