Android Webview multitouch touchstart event not working with more than 2 fingers

Consider the following code:

canvas.addEventListener('touchstart', function(event) {

When I tap with 2 fingers at the same time I have the following output (which is cool because is printed two times):

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    I/chromium(26508): [INFO:CONSOLE(69)] "start", source: file:///android_asset/index.html (69)
    I/chromium(26508): [INFO:CONSOLE(69)] "start", source: file:///android_asset/index.html (69)

    But when I use more than 2 fingers at the same time I had the same result, what am I doing wrong?
    I was expected the log “start” as many times as fingers I was using.

    In the other side touchmove and touchend works well.

    I have uploaded the code here

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