Forever World Pre-Deep North

Forgive me if this has been answered already - Do we have any confirmation from devs that updating to Deep North will or will not effect a seed that’s already been explored? I keep hearing streamers mention not to go too far North to avoid any procedural generation issues but I want to be 100% before grinding through the first 7 bosses and hoarding resources to prep for the new content. Any information would be helpful! Thanks in advance!