Hidden Power/Protean doesnt work?

For some reason when my greninja uses Hidden Power - Fire it doesn’t become a fire type. it becomes a normal type (original type of hidden power move). Is this going to be fixed?

No. Hidden Power is a based Normal type move, so It’ll be normal

in normal pokemon it changes per the type of the hidden power (in my case it would be fire type). Thus this SHOULD be fixed. I’m just wondering if it will be