I see what you are trying to do. I have not really tried this, but it should work. I do notice that some of the items are duplicated in the 3rd multiselect option. I am wondering if there is a data issue that might be causing this. The only way to really test that would be to try on different lists that has a smaller dataset and no items with the same title. That can be a big task, but everything else seems to be okay.
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