Were you able to test this in medium-to-low light conditions using US version Note 10?
If you can please upload a 20-30 sec sample of 1080p 60 vs 30fps, it would be very useful for me to compare my phone with it as I do no have access to any US variant nor do I know anyone with note 10 among my friends.
This will help me talk to the support team in my region.
I've recently discovered the same problem on my s10e. After playing around for a while, I think I've found a solution.
If you change the HDR setting to be 'always on', in stead of 'when needed', the blur dissapears when making a video in 60fps. Or at least on my phone, I hope it works on yours as well!
Thanks for the suggestion. I will try and see tonight how it affects the video.
I did post this as a feedback and received a reply from the samsung members team.
(I can't attach images for some reason.. samsung.. fix your forums..)