i fixed it by following Freyr05's instructionsinstall version 8.2cstart gamego to settings and enable custom contentchange version back to unstable (currently 9.0b_0004)
play game normally with custom content :D
how? when downgrading to v8 it wont find any save datas from v9
not in the save data, but in the main menu settings
custom content wasn't save specific before
