I've been using the Microsoft Edge beta build 79.0.309.11 (Official build) dev(64-bit) on my laptop.
Since it's a laptop, i've been using it predominantly with a touchpad with windows precision drivers.
While using the browser, I found that scrolling on the touchpad (two finger swipes) often result in some horizontal movement at the end of the swipe, possibly due to my fingers not swiping completely vertical. Might be due to the back and forward swipe gestures too.
This results in quite a jarring experience especially when following text while scrolling.
May I suggest that if the browser detects vertical scrolling after a certain amount of distance, the horizontal scrolling is automatically disabled? If i'm not mistaken, most touch based devices do this.
Can't believe this isn't getting more attention, unless it's something that's already been mentioned millions of times and is being worked on.
I keep getting random horizontal scrolls as well, and it makes the whole scrolling experience quite silly. The really annoying thing is that this happens on websites that don't even extend horizontally; even scrolling through Google (ahem, sorry, Bing) search results produces random horizontal movements that make it almost unusable.