Pluto was classified as a planet for many years. The issue was that additional bodies similar to Pluto were then discovered beyond Pluto. At some point the astronomical community felt they either had to choose between adding those other bodies into the solar system, or to delist Pluto from its planet status. They chose the latter. The things like distance, size and characteristic of its orbit are some of the main reasons to call it something other than a bonafide planet.
Ultimately, Pluto doesn’t care.
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