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@jmings,
In the code sample that you have shared, replacing this.chart.render() with e.chart.render() should work fine. Please take a look at this documentation page for more information to Hide Unhide Data Series on Legend Click.
this.chart.render()
e.chart.render()
If you are still facing any issue, kindly create a sample project reproducing the issue and share it with us over Google-Drive or Onedrive so that we can run the code locally, understand the scenario better and help you out.
___________ Indranil Deo Team CanvasJS