API described at https://documentation.magnolia-cms.com/display/DOCS62/Link+field documentation does not work when linking from an M6 app to an M5 app.

Linking from an M6 to an M5 app will continue to be a frequent use case. Some Magnoila shipped apps are M5 apps, such as the Stories app and the Categories app, and the apps in the Travel Demo.
Apps created for projects will be M5 apps. And apps created by partners or used in Incubator modules or in 3rd party extensions will continue to be M5 apps until they are migrated.

Ideally the API documented would work as-is when linking from an M6 to an M5 app. Alternatively the API should be as straightforward to configure as the current M6->M5 app or M5->M5 app.

A specific example:

When adding a linkField to a dialog, the select chooser is empty, see attached screenshot. Tested on demo author, contacts-v8 app

// code placeholder
categoryLinkField:
  label: Categories
  $type: linkField
  buttonSelectNewLabel: Select new ...
  buttonSelectOtherLabel: Select another ...
  chooser:
    workbenchChooser:
      datasource:
        $type: jcrDatasource
        workspace: category
        rootPath: /
        previewDefinition:
          nodeName: name

Note: the config above doesn't have an app reference nor a custom workbench config so could not work.