I don't think those are fanedits - Forces Speed Battle has a Tails render with the same change you described.
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FazDude
Wario Wario Wario
At the very least this one absolutely is (very much an impressive edit though)
FazDude
Oh yeah, that one's def fan-made - His tails are posed differently in the official Speed Battle render.
Venus of the Desert Bloom
Someone forgot to smooth out the clone brush marks.