Tagging u/Psyonix_Sofia for visibility.
Playing on Xbox Series X and that's important, as this bug is not present on Xbox One.
I don't know why this is, but ever since I continued playing on Series X, this corruption appears whenever the camera gets too close to the models. I'm assuming it applies to both the Rocket Boost and Goal Explosion of League Legacy as both share the same source model pool.
Since I only play on Xbox, I can't speak of the other platform versions. Players on PS4/5, Switch and PC, sound off and let me know if this happens on there as well!