yes, it can happen that GFCI前面还有GFCI
it is a waste of GFCI, but it happens, more often in the kitchen where you have multiple outlet. In your case, it can be in the neighboring bathroom if sharing the same wall.
it is a waste of GFCI, but it happens, more often in the kitchen where you have multiple outlet. In your case, it can be in the neighboring bathroom if sharing the same wall.