Warning to transfer purchased items from iPhone to Mac, even though all data had been backed up to Mac
I am trying to follow this process:
Update your iPhone, iPad, or iPod touch with the Finder - Apple Support
However, I get this warning when I click Update:
There are purchased items on the iPhone that have not been transferred to your Mac. You should transfer these items to your Mac before updating this iPhone.
Nice warning, except I had backed up all of the data on the iPhone to my Mac just minutes earlier. Maybe I should report this to Apple as a bug.
Here is a very similar thread from four years ago:
Updating iOS using Mac: Message about "pu… - Apple Community
The "Community Specialist" who answered that question said, "you should try backup the device first," so that answer was not helpful.
Earlier iPhone models