Now this one, I don't get at all.
I found this out by wearing my character creator skin on my server, and no one seeing it, they all see me as steve or alex, randomly.
How this slipped through the cracks... well, all I can say is those cracks seem to be the size of the Marianas trench at this point, given how many obvious bugs get through anymore.
There are no steps to reproduce, just wear a character creator skin and no one will be able to see it. I even tested removing 3D geometry items and it still happened.
As you can see, my friend joined to get screenshots. I show as steve for him, while I clearly am not steve on my end.
This essentially makes the character creator a blatent scam...