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The red dwarf 30 Arietis Bb had a minimum mass of nearly 10 times that of Jupiter. In 2020, after the inclination of the planetary orbit was measured to be just 4.14 −0.90°, the "planet" was found to fall in the mass range of the red dwarf star.
References
^ Kiefer, Flavien; Hébrard, Guillaume; Lecavelier, Alain; Martioli, Eder; Dalal, Shweta; Vidal-Madjar, Alfred (2021), "Determining the true mass of radial-velocity exoplanets with Gaia 9 planet candidates in the brown-dwarf/stellar regime and 27 confirmed planets", Astronomy & Astrophysics, A7: 645, arXiv:2009.14164, doi:10.1051/0004-6361/202039168, S2CID221995447