The Lost Kingdom is bugged?

[MrJelly]

I took the quest from the Minotaur king and after that I killed him, but the quest never went off.

I also never toke the quest but I didn't take a notification about failing it or +1 on the quest list.

I don't know if this is a bug or a punishment for killing the cow King.

 

[VDX_360]

If you kill the Minotaur king, you can't complete the quest.

A previous version of the Wiki might have included a note of that outcome.

 

[MrJelly]

Still... You should be able to fail it. Now it's null.