How to inject async reducer ( indexedDB )

[JSmithOner]

I'm trying to inject some reducers with APP_INITIALIZER Token. Everything loads except my state don't get initialised. Any Ideas?

    {
      provide: APP_INITIALIZER,
      useFactory: modelReducer,
    },

export function modelReducer () {
        return async () => [ await createIndexedDBRehydrateReducer(
            'bigState',
            initialState,
            on( saveMaleModel, ( state:unknown, action:{ payload:Blob } ) => {
                ( state as State ).models.male = action.payload
                return ( state ); 
            } ),
            on( saveFemaleModel, ( state:unknown, action:{ payload:Blob } ) => {
                ( state as State ).models.female = action.payload
                return ( state ); 
            } ),
            on( saveTransgenderModel, ( state:unknown, action:{ payload:Blob } ) => {
                ( state as State ).models.transgender = action.payload
                return ( state ); 
            } )
        ) ]

}