Fandom Problem #14,793:
The way the term headcanon has lost its meaning and most of people just say it about anything they decided to make up
Note: a headcanon is something that is compliant with canon, but not explicitly stated in any official material, such as “Alice likes apples more than pears”
It is not anything that contradicts canon; I think that people generally use “au” for that even though I think that if it’s just a tiny variation it should have its own term, but I can’t find any so that explains why people misuse headcanon











