Bug causing FontBook to incorrectly display an installation failure error pop-up when multiple font files are selected
A bug in FontBook causes the app to incorrectly show an installation failure pop-up window when multiple font files are selected. This issue wasn't observed on previous macOSes.
The install failure notice is followed by this message:
"Some unsigned or inactive fonts were found. Make sure if duplicates from the same filename are already present."
Mac mini, macOS 10.15