Tapping with wacom tablet sends duplicated mouse events

When clicking on text within a web page, mousedown and mouseup events are duplicated. This typically leads to single clicks on a page being interpreted as double clicks, causing attempts to e.g. move a text cursor to instead select and highlight the clicked word.

Interestingly, I can reproduce this behavior in the simplebrowser example, but not in the quicknanobrowser example.

This is with a Wacom Intuos S, running on macOS 10.14.5, using the latest Wacom drivers as installed from https://www.wacom.com/en/support/product-support/drivers (version 6.3.34-2). Other users have reported the same issue with other Wacom tablets, though.