When you’re taking a photo of a document how far away from the document are you? The iPhone might be thinking you’re trying to take a macro picture but the macro camera focus distance is much further on the 14 Pro than 13 Pro. Maybe try enabling the toggle for manual macromode in camera settings.
I don’t know exactly at what distance it is. There is a big lag overall in iPhone’s 14 Pro Max cameras. It is not related to the Macro mode though, I know because I had already toggled the setting previous to that.