Unexpected result on project template copy

Hello ,
As I use a lot the same kind of project, I've created a template of this kind :
Main project
- Sub project 1
-- Sub sub project 1
-- Sub sub project 2
- Sub project 2
-- Sub sub project 1
-- Sub sub project 2

When i copy the template "main project" I have a result that is unexpected :
- no error on copy
- Main project and all belonging sub projects appears inside the Today window
- Only the Main project appears inside the project window

I was expecting to find inside project window all the sub project.
Is it a bug or am I doing something wrong ?

Thansk for your feed back
Olivier

Yes the issue persists after disconnect/reconnect
I also try a reboot of my linux server without any changes

OK i've found where the issue is :

When you duplicate the template you specifie the project type.

It seems that all sub-projects doesn't inherit the new project type and remain as template