actually i dont know if it's the itunes version of the ios.
it does resolved the non-tally issue between itunes and iphone storage for me.
I used to find that my itunes and phones storage numbers dont tally. Like itunes claimed i got 180gb free and if i go to Settings>General>Phone Storage, it will shows i got 190 or something free. Now after updating the itunes and ios, both numbers tallied now.
Eventhough i had been transferring backup to a new phone since my iPhone 6P days though but if the issue is with the backup, i would have the same issue now though

