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I used to play with my son in single player co op just fine. after trying to play today we found that he can no longer see me in the game even though I can see him just fine. we tried playing on his world and we could see each other but whenever he tried to play on mine the problem occurred again.
It started after I did a major build project using Shani’s mod to decorate my base extensively using admin and creative mod to access the props. I also played around with the Fashionist mod to change the way armor appeared on my player.