I noticed while making commands and testing my map that any custom head I had would be Steve, and I'm not sure why. This started since 1.13.2, and has not fixed itself since.

I tried to upload screenshots but Jira is being stupid and saying "missing tokens" or something like that. But you already get the point, they have a steve head as apposed to the custom player skull I gave them.

(The skulls I gave were MHF_Villager and MHF_Vex)