I tried giving myself a head with the {SkullOwner:} tag in the snapshot.
The specific command I used was*: /give @p player_head{SkullOwner:colin} 1*
It instantly closed my world and was stuck on the saving screen for 20 mins before I gave up and closed Minecraft in task manager.
When I restarted the game and rejoined the world, everything was saved correctly and the head was in my inventory.
Comments 3
Incomplete without a crash report from (minecraft/crash-reports/crash-<DATE>-client.txt). Please attach it to this ticket so that we can diagnose your issue.
It worked fine the second time I executed the command.
The first command was my first time loading in a custom head in that world, if that is something that possibly contributed to the world crashing.