Script service installed on a wiki (not on root) is not found by script manager

I don't know if this is a recent regression or not.

To reproduce:

• Install xwiki-platform-git module using the EM UI
• Create a page with

{{velocity}}
$services.git
{{/velocity}}

• Verify that it's not resolved properly
• Then clean up your data/extension directory and copy the 4 depds to WEB-INF/lib (gitective, xwiki-platform-git, jgit and jsch)
• Go again to the page and verify it works this time