Nested Quicktabs - problem with Callback-paths wrong arguments delivered

Hi,

I'm developing my own module which creates a Data Display for 2 Parameters.

I want to display my data with QT (Ajax necessary) in the following way:

• All Time
  • Project 1
  • Project 2
• 2014
  • Project 1
  • Project 2

...

I create the first Quicktabblock (with the years as Tabs) inside the hook_node_view.
As Content I use a callback with path
ltw/$nid/$year
The callback returns a new QT (with projects as Tabs) As content of the tabs I use the callback again with the following path:
ltw/$nid/$year/$project

This structure works for the default tab of the first Level QT but it doesn't for the others.
This example shows the current behaviour (with the displayed content in bold):

• All Time
  • Project 1 - All Time Project 1
  • Project 2 - All Time Project 2
• 2014
  • Project 1 - 2014 Project 1
  • Project 2 - 2014 Project 1

I've attached a small video which shows the bug.