So, After investigating it seem related to the issue that the listener on the upgrade process are not correctly called when an extension is installed/upgrade in the sub-wiki.
Seem that the listener JobFinishedEvent("install") is not called when we install or upgrade an extension in the sub-wiki. Maybe it's related to the fact that the module which contains this listener is installed in the root namespace. Thomas Mortagne do you know if it could be the cause of this listener not called when we install or upgrade an extension into a sub-wiki ?
Note that for now the workaround is just to restart the wiki instance. At the reboot of the wiki, the listener is also expected to be called (and it seem working from my tests) so this should handle the migration of the data if needed.
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