Thanks for reaching out here. Have you contacted the channel provider's support team yet to report the issue you are seeing, and inquire further?
I was hoping that I gave you enough information to pursue this with your technical department. I have reached out to Netflix chat help, but I doubt that it's useful. Netflix being Roku's most used channel, I was hoping that Roku and Netflix had an open relationship to fix issues like these when they crop up...
Thanks for the notes here. I followed up with our team, and it looks like this is the current intended behavior as of OS 9.1. The 'Auto-adjust display refresh rate' feature no longer applies to the Netflix channel at this time.
I apologize for any confusion here. I'll continue to provide any further updates here if there is any additional news to share.