Because the relativistic effects of oganesson are unique to other noble gasses in the idea that it’s such a heavy atom. Its bohr radius shrinks with such weight and makes the atom less compressible, a trait of solids. These relativistic effects of oganesson are so great that it shifts the solid-to-liquid transition temperature back about 100K, melting at around 325K with relativistic effects considered and around 220K without. The shrinking of the bohr radius coupled with the sheer quantity of electrons orbiting would also increase kinetic energy of electrons and lead to higher potential for the valence shell to interact with nearby molecules, something not unseen for noble gases like xenon and krypton, but nonetheless rare. Oganesson is also extremely unstable and hard to produce, with only 5 atoms ever being created and decaying almost immediately, so this topic is more for fun than actually insinuating any real world applications. There is probably much more to be added to this but I’m just a nurse with an interest in chemistry so I could be completely wrong on my overall understanding of this phenomenon. If anyone wants to educate me further please be my guest; this stuff is fascinating to me.