Known exoplanets as a function of their radius and period from the NASA Exoplanet Archive (Akeson et al. 2013) within the Neptunian desert and savannah. The color represents the density of planets. TOI-5398 b is highlighted with a purple diamond, while planet c is highlighted with a cyan one. The arrow indicates the expected position of planet b within the savannah at the end of its evolution according to Mantovan et al. (2024b). The marker size is proportional to the planetary mass.