New materials don't work in Client

(Correct me if I’m missing some info about materials and stuff)

For me, the new materials work fine in studio but don’t show up in the Client or when I’m running in Play Solo or private server mode. For some reason, they show up as the older materials (Cobblestone shows as Slate, Metal shows as DiamondPlate etc…)

Have they only applied it to studio so far? Or is it a bug regarding client mode?

Yes, if you see the update message, currently they have not been turned on replication wise because the mobile devices don’t support them yet, so the mobile devices receiving would be like “Wat?? crash” (The update has to go through Apple’s update process first).

Once the mobile devices have been updated, replication will be turned on for new materials for everyone at the same time. Think of the addition to studio as a preview such that you can get you place updated to use the new materials as soon as they are available.