I am glad I found this post, but a little frustrated that it took several searches and a couple of hours of trial and error along with research to finally uncover it. I would strongly recommend that you put a note in the core documentation of List Box widgets that the only way to make them work as expected is to use a local variable in between the aggregate and the list box. And include a link to the documentation for how to make a hybrid local variable that includes an entity along with a single new field (the Boolean value for the selection attribute).
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