It’s working as intended. No changes were made for chunk generation in this snapshot, sometimes the seed can create small biomes like this.
It’s working as intended. You can use
/fetchprofile name <name>or
/fetchprofile id <id> command to generate static player head command.
I don’t think we can say the game is in the same place since 2014 so we cannot expect same behaviour as is before.
It’s not caused by Minecraft. It's an issue that occurs in all programming languages because of IEEE-754 design used to represent floats.