Thanks Brett,
I have linked the sketch file under the video link also.
If you right click the video and inspect it you can view the link and download the video also. (I dont know why it rendered it as a video and then wont play it - file size perhaps !!)
I feel like this issue (if it is as you said) combined with the color profile issue
here Prototype preview colors are muted (not adopting P3 settings?) is huge and almost makes protoypes redundent. The prototype needs to reflect whats on the canvas in terms of layer arrangement, colors, etc.
( I say that as I have spent a huge amount of time on this current project making every component clickable, scrollable etc so the prototype feels like the real thing before development begins)
I appreciate your efforts in getting a fix on this asap.