I had a similar thing with whether Giant Pandas were actual bears or not when I was a kid. The genetic tests that determined they were definitely bears happened

I had a similar thing with whether Giant Pandas were actual bears or not when I was a kid. The genetic tests that determined they were definitely bears happened five years before I was born, but I still got taught the "We used to think they were bears, but they're actually more closely related to raccoons" version until high school.