I just checked mine and it has used 205mb. I've last reseted statistics on March 27th, but I believe this rise happened in the last 3 days. I thought updating to iOS 16.4, disabling settings use of cellular data and disabling automatic updates would fix it but it did not. I have now disabled background updates over cellular data to see if this would have any effect. I have also reported the bug in the feedback app as instructed by @snyp1193