Nesting views with a node reference field
You can solve it with Viewfield.  


  View arguments are supplied through tokens.  


So, what you should do:  


Add new type of your view (new Block, for example) and add contextual filter by node reference field.
You can modify display format etc.
Create for your tasks new field "View Reference" and set your new display type of view. Check «Always use default value».
Set [node:nid] in Arguments input.


Tested on D7.