Return variables on task includes not working anymore

I use to be able to do things like:

included_general_task.yml

Are you intending “root_list” and “tmp_list” to be expanded into “{{ root_list }}” and “{{ tmp_list }}” (by nature of the substitution into “list”?)

If I understood him correct he wants to store the results in a
variable, whose name is not fixed but rather defined in another variable.

I wonder why one list containing the results is not a viable option.
Dan, can you tell us?

Johannes