drawing stutters and ends in Chrome on Android

[skierpage]

Amazing! When I try https://vleue.itch.io/bevmnist-poc in Chrome on a Pixel 3, it draws a few blobs tracking my finger, then it stops updating. So to draw a reasonably-sized '1' I have to draw four segments, and a '3' takes about 10 (and it does recognize both well). When I press [Clear] it draws a line of blobs towards the button extending to the edge of the input canvas, suggesting it is still in some touch-tracking mode.

Chrome version 88.0.4324.181