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I have moved this question into our Developer portal to give it better visibility to Tableau Community members that will most likely be able to assist.
Another resource would be to post the issues being experienced to the 'issues' section of the below GitHub page.
Additionally, I think that the following could also be used to create the desired result, the following is a document in the Tableau Community about using Python to create a nice smooted line over the bar chart.
Hope this helps!
I will check these out in an hour or two and will share my results.
Happy to help!