Expected behavior nextStep() should take effect Actual behavior error: $setup.abrechnungsStepper?.nextStep is not a function Resources (screenshots, code snippets etc.)

const abrechnungsStepper = ref<InstanceType<typeof MDBStepper> | null>(null);

<MDBStepperStep active ref="abrechnungsStepper">
        <MDBStepperHead icon="1">
Arbeitszeit-Matrix
        </MDBStepperHead>
        <MDBStepperContent>    
<AbrechnungMatrixComponent @finalize="abrechnungsStepper?.nextStep()"/>
</MDBStepperContent>
      </MDBStepperStep>
</MDBStepper>