Skins not accessible when not connected to the internet (parity issue)

Minecraft skins are not accessible when not connected to the internet, even when the skins are downloaded directly to the computer.

How to reproduce

Turn of the internet and then try to change skin. It will say “Sorry! We could not load your skins.”.

This is a parity issue because in MCBE you can access skins even when not connected to the internet.