Controll stepper step index

[DAVIAMERICO242]

I have a <Stepper/> component set as:

<Stepper activeStep={activeIndex} onChangeStep={validateStepProgress} ref={stepperRef} style={{ flexBasis: '50rem' }} orientation={isMobile?"vertical":"horizontal"}>...rest of code

where

    const [activeIndex,setActiveIndex] = useState(0);

    const validateStepProgress = (e:{['index']:number})=>{
        if(invalidLogic){//though just about going foward not going to a previous step
             setActiveIndex(e.index-1 )
        }
    }

The problem is stepper always progress regardless activeIndex state