I made a resource pack that replaces one of the new skins with "Tuxedo Steve" from the Legacy Console edition, but it doesn't work in-game. The resource pack format is 100% correct, but it seems like the new skin files are only used for offline players.
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I don't recall them working like that, there used to be a lot of texture packs that changed the steve texture and it affected multiplayer. Even then, it's not optimal behavior. If I want to modify a default skin so all the instances of that skin look a certain way in order to fit in with my resource pack's artstyle, I should be able to.
That's how steve.png and alex.png have always worked in the past too; if not offline, it just gets your skin data fromthe servers.
This is not a bug.