Missing scripts on gameObject created from asset bundle

I have a prefab with 2 scripts A and B attached to it. The prefab is packaged into an asset bundle and streamed from server if needed.

The problem is that when game object is instantiated only script A is present with all the right settings (public field values), but B is missing.

The problem is present in Web Player, but in the Editor everything is fine. Any idea why? Isn't it supposed to work?

I know that you can't package scripts in asset bundles and expect them to work, need to load them manually using Reflection.