I have a problem with my jungle. I recently build a arena to fight Plantera, but she gets enranged and destroys me because in the middle of the arena(above the red line in the screenshot), the jungle stops being jungle and starts being cavern for some reason(it wasn't like that before i exploded this huge hole). Is there a way to turn all of this space back to jungle? Will it be back being jungle if i cover ALL of the inside, from top to bottom with jungle walls(sold by dryad)? Plz help, i'm not interested in building other massive arena like just to fight one boss... Thx in advance.