Player head SkullOwner tag with username string no longer works

Player head items no longer store/evaluate the SkullOwner data tag when a username string is provided. (SkullOwner compounds with Id and Properties still work.)

Sample command:

/give @s player_head{SkullOwner:"MHF_Question"}

Expected behavior: Receive MHF_Question's head

Actual behavior: Receive blank player head