When I play Minecraft Offline, that is, without being connected to the internet, the skins that my character appears on are only those of Steve and Alex, and even more so are the old ones 

Since in fact it should appear in addition to the new skins of Steve and Alex, also the skins of the new characters like: Zuri, Makena, Sunny, and the others

In case you didn't understand well, I've attached two pictures, showing what's happening and what should happen