This section of the forum is now closed; we are working on a new support model for WDL that we will share here shortly. For Cromwell-specific issues, see the Cromwell docs and post questions on Github.
The WDL specification should clarify its globbing implementation
I've also created a ticket for this in the WDL GitHub repository.
The short of it is that the definition of globbing varies from shell to shell, and language to language. While there are some common foundations, it really shouldn't be up to the user to try and figure out what the implementation is by trial-and-error.