No linkable item found in Calendar in Ventura [fixed in Integration version 249]

What’s your macOS version? My macOS version is 13.1.

Have you try this:

1.1 Your accessibility permission database is corrupted

The macOS accessibility permissions database can get confused. In that case you might see strange behavior like not being able to disable or enable permissions for an app. In that case, you may reset Accessibility for Hookmark as follows:

  1. tccutil reset Accessibility com.cogsciapps.hook
  2. Reboot your Mac.

For example: Accessibility problem – Discussion & Help – Hookmark Forum.