I tried adding SetTouchMode(true) but that doesn't seem to have any effect.
I found an old (2017) post "WebView and SimulateTouch" which says
web view and simulate touch doesn't work for all devices
As far as I can tell the Webview is being touched (it fires it's own OnTouch) it just doesn't react (open links, etc).
To get correct x and y I have a separate webview with an ontouch where I get the first element of x and first element of y.