Wrong metatag default values are displayed in the node form when adding a translation

When using metatags with content translation, the configured default meta tags for nodes are not displayed when adding a new node translation.

Steps to reproduce:
On a site with content translation enabled, and multiple languages active, with a standard/default installation of metatag:

• Add a node in the site default language. Observe the default metatag title and description are displayed in the form.
• Click 'add translation', which takes you to the node edit form.

Expected result:
The meta title and meta description fields should be pre-filled with the default values for nodes ("[node:title] | [site:name]" and "[node:summary]", respectively)

Actual result:
The meta title field incorrectly defaults to the global meta title of "[current-page:title] | [site:name]" (instead of the content/node default title) and the meta description is empty.

Note that if you translate the node title and the node body, and do not edit the meta tag fields, the correct meta tag values are output when viewing the node. The correct values are also displayed when you subsequently edit the translation. It just seems to display the wrong defaults when initially adding the translation.