K2-399 b is not a planet: The Saturn that wandered through the Neptune desert is actually a hierarchical eclipsing binary - Lillo-Box, J.; Latham, D. W.; Collins, Karen A.; Armstrong, D. J.; Gandolfi, D.; Jensen, Eric L.N.; Castro-González, A.; Balsalobre-Ruza, O.; Montesinos, B.; Sousa, S.G.; Aceituno, J.; Schwarz, R.; et al. (Astronomy and Astrophysics, 2024)