Not sure if this is an Adobe or Apple issue, or both. Happens in both After Effects and Premiere.
The only way to open the project isFile > Open Project...from within Ae/Pr, which requires me to navigate to the containing folder from the Open dialog window. Opening fromFile > Open Recent >also works.
It's not a file-association issue; I've checked that.
Even dragging theaepon to the Ae icon (in Dock or app switcher) doesn’t work.
Sometimes restarting the computer will temporarily fix the issue.
A while back, I solved the issue without restarting by going toSystem Preferences > Security > Full Disk Access > Enable After Effects. But that isn't working anymore.
I've tried Repairing Disk via Disk Utility.
I've tried rebuilding the launch services database.