Sanity check on action submenus


Try as I might I can't seem to get action submenus to work.
I created an empty action group called test#test1 and another action group with 1 action like this:
grafik
The action within test1 does this:
grafik
Using test1 directly changes the artist tag (replaces The with ehT ).
grafik
But calling it from the submenu does nothing.

Is there something I'm doing wrong/not understanding correctly?

If the action group in the submenu is empty then it does not do anything, of course.
If you have a look at the actions folder then you will see that there is a file for TEST1 and one for TEST#TEST1 - so these are actually 2 different entities.