iPhone charging issues on iOS 18

Since updating to iOS 18 my iPhone 14 Pro Max is charging very slowly, taking around 9 hours to fully charge.

The battery charge in creases linearly very slowly. Prior to iOS 18 it would charge quickly at first then slow down a bit but total charge time was under 2 hours but now about 9 hours. It’s saying it’s a slow charger when it does this. I should not have to get a new charger because of an iOS update and the phone was charging fine before the update.

Is there an ios18 update that will fix this issue as it is not a hardware problem with either the phone or chargers.