I downloaded a mod that lets you play as an Octoling in Splatoon 1 (here’s the link: Playable Agent 8 + Octopus Mod for Splatoon | Splatoon Mods). I can join online matches, but whenever the “Go” text appears, I get a connection error. There’s no error code, and it doesn’t look like a typical Wii U system error. I’m not sure why this happens, but disabling SDCafiine seems to fix the problem. Is Pretendo mad at this mod, even though it should only affect the game on my side?
EDIT: Solved! the mod edits static.pack which is hashed at round start and can thow errors. just needed Nohash Mod for Splatoon | Splatoon Mods to patch the hashing.