Got the samples, thanks.
Not able to reproduce - tried several phones with Android 6.0 - 7.0 - 8.0 - 8.1, perfect every time.
We have two complaints so far for Xiaomi phones and one for Huawei.
This started a couple of weeks ago - we did not have any updates around that time, but Google may have updated WebView and/or Chrome.
Clearly we're "triggering" - "something", not sure what it is yet. Going to keep an eye on it, but no thoughts on what it is yet.