Well there's a potential paper right there. Take male/female researcher and pump them full of hormones and see if it also affects the mice behaviour too.
Don’t know why you’re being downvoted. Gender isn’t a real thing biologically, it is a societal construct. It describes human behavior. So the gender role of the researcher can’t possibly have an effect on the experiment as it is imaginary. Only the sex of the researcher is what can trigger a response, as there is a biological basis.