Photos library inaccessible after Ventura upgrade

I've just updated my OS to Ventura on my 2021 M1 Max MacBook Pro. I've tried to open my Photos library, and it is failing. My photos library is run off an external hard drive.

When I try to open Photos, I get this error: "The library could not be opened. Photos was unaple to open the library "Photos Library". (5600).

When I try to manually assign the library location, I get this error: "Failed to create the default directory paths for library url: file:///Volumes/external/iPhotos/Photos%20Library.photoslibrary/". The program then quits.

This all worked correctly (albeit slow, because Photos is abysmal at handling large libraries) prior to the OS upgrade.

Has anyone else had this issue? Or have any ideas of how to fix?

I backed everything up prior to the upgrade so worst case I can always roll everything back, but I would obviously prefer not to do that.