Some of the new player heads are missing

I had 5 of the new player head skins spawned in-game, I found today that 2 were missing (one was the villager). I also tried to do a search of this and came up empty. Also, I used the same exact code both times (and there were not any typos).

EDIT: I logged back in just now from a while ago, and see that the skins are back. I do feel that this bug should be fixed though, since relogging anytime the skins are missing would be rather tedious.