Upon logging into Realms, I have found that the player list shows the player's skins, rather than their IGN. The skin matches the previous player's skin, but the first person on the list is unaffected. I have attached a picture of what I am talking about, or you can click the link here to view a video visual representation of the issue (via myself on Twitter).

View on Twitter: https://twitter.com/TobyMinceraft/status/1019967022938062849 (Note: there is audio, but for some reason I can no longer hear it)

Restarting Minecraft (and computer) did not fix the problem; however, upon going back to Realms after restarting the game fixes it for a few milliseconds, but then returns to jumbled skin textures.