Drush is unable to see commands in modules in static custom platform

Hello, I suspect something wrong with latest drush in barracuda.

I'm investigating, but it seems that i'm not able to invoke any drush commands provided by modules, when inside custom platforms (/data/disk/o1/static/platformname).

I installed a fresh BOA HEAD yesterday on a new Debian 7 server and copied some custom platforms and sites from other systems and they work.

I then tried to enable advagg and migrate modules (both contains drush commands) and they work in the website,
but not with drush.
I get:

o1@testserver:~$ drush @testsite.dev pm-list | grep advagg
[...]
Advanced CSS/JS Aggregation          Advanced CSS/JS Aggregation (advagg)              Module  Enabled        7.x-2.5
[...]

o1@testserver:~$ drush @testsite.dev advagg-cron
The drush command 'advagg-cron' could not be found.

I will try with a different custom platform to see if it is platform specific, but do you know if it's possible that is something related to php include paths or similar?
On older BOA i had no troubles with the same platform and it works also on DRUPAL 7.2 P.001 standard platform on this server...

Thanks for your help