Shouldn't "Add Translation" node/add urls pass source translation nid?

Let's say your source node is in English and has a node id of 123.

When viewing the English node if you click on the Translate tab you go to
node/123/translate
On the resulting page, the Add translation urls look like
node/add/[node-type]?translation=123&language=[ln]

When viewing the translated (let's say Spanish) node with node id 124 the "Translate" tab goes to
node/124/translate
On the resulting page the Add translation urls look like
node/add/[node-type]?translation=124&language=[ln]

The only, but rather big, problem with creating a node the second way is that the URL alias for the subsequent translation is not updated but a new one is created.

I'm testing with
Drupal 6.22 with this popular patch to the core Path module: http://drupal.org/node/269877#comment-4293670
i18n 6.x-1.10
Pathauto 6.x-1.6