I opened the new button to create a new simulation, and I selected a random exoplanet, the planet's name is HD 74156 c, it is nearly 8 x the mass of Jupiter and 1.64x Jupiter's radius as shown here, it is believed to be one of the largest planets known, but, somehow, it has a rocky texture, I'm starting to believe that rocky Jupiters exist, though they must be very rare, if it's a bug, then it must be a cool one, if rocky Jupiters exist, then Jupiters with extreme densities must be terrestrials, making them extreme Mega Earths, and after all, Kepler-10 c was once believed to be the first Mega Earth discovered, and it's only 2.35 x Earth's radius, but thought to have an astounding 17.2 Earth masses, more than Neptune.
Kepler-22b's is large too, but we're not sure whether it's terrestrial or neptunian, it could be both.
Here's a screenshot of HD 74156 c, it's radius is 113645 km, while Earth's mean radius is 6371 km, so HD 74156 c is much bigger than Jupiter, and yet it's rocky, pretty weird.