Ruined Nether Portals Not Spawning?

I recently got the newest version of cobblemon. I dont have any other mods installed that effect terrain (i do have other mods, but its just the standard qol mods). Im on 1.21, however, ive been wandering that world for HOURS and havent found a SINGLE ruined nether portal. Is there something effecting their spawn, or am I just unlucky?