I downloaded the beta recently from Xbox Insiders. When I loaded up a new survival world I was having issues with the left click but didn't understand what it was. I opened a new creative world and discovered the pattern. Whenever I move in game the attack/destroy button stops working and only starts again when I stand still.

I deleted and then redownloaded the beta. It worked fine while I was playing it then, but I just logged on and the problem is back.

Update: I left the beta and the problem is now in the current version. Looked it up and there was a similar issue on Java a while ago. It involved turning the touch pad sensitivity to the highest setting. It worked, I'm just confused on why its a problem now and it wasn't before and why it is a problem.

 This video is an example: https://www.youtube.com/watch?v=clL7X1Vej1Y