Token variable not converted in email or message sent with action trigered by workflow module

I have created a 'send email' and a 'Display a message to the user' action using somes variables %site_name, %username, %title, %node_url, %teaser

When I use theses actions with trigger/content 'After saving a new post', the variables are replaced with proper content.

When I use theses action with trigger/workflow 'When page moves from Database entry: (creation) to Database entry: Review' In both messages, the %title, %node_url and %teaser are not replaced and %site_name and %username are replaced correctly.

I have tried with different type of content and the result is the same. This function used to work in the past but since then I added many modules to my site and I réalized the problem a month after.

My site is using Drupal6.14 (the problem was there in Drupal 6.10 before my upgrade) with two language (french and english)