When I change hostile mode to 1, mobs still attack me. Version is 1.12.2.

As Morph has just been rewritten and released for MC 1.16.5, I am clearing the issue tracker as I have not provided any support Morph for 1.12.2 and earlier. My apologies for not addressing your issue.

This is happening to me too, I guess this isn’t fully implemented into 1.12.2