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XML modules contain their own support for pluging actions into menu of their nodes or editor context menu. This is an extra layer of overhead and complexity. The pattern is: CollectSystemAction is support class able to collect several actions from default lookup and present them in menu. Its subclasses are used in various nodes and only define what marked interface will be used to look for real actions - CollectDTDAction used in DTDDataObject then presents all actions from default lookup implementing CollectDTDAction.DTDAction like CSSStyleAction. It is better to move real actions directly to folders defining actions for DataObjects and skip this layer (lookup listeners, need to generate menus here, ability to define positioning simply, ...).
Will try to fix for 6.0, but can't promise.
Its a task and not a bug per se. Lets work on it post 6.5.