Can not add a leveled item via additem

According to Greatness7 when you have a leveled list inside of a leveled list they resolve in vanilla and you can get the contents of both when you open the container. You can't add a leveled list to a player in vanilla, but MCP fixes this so that could reasonably be implemented too. This doesn't seem to work in OpenMW and throws an error message when trying to do it. Also when I have a script that tries to add one to the player it crashes the script.

(RM-3945 from redmine: created on 2017-07-02 by halbe null, , closed on 2017-08-03 by nobody, duplicates #2404 (closed))

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