Scrollbars not clickable on macOS when system wide setting is set to show scrollbars based on mouse or trackpad input

On macOS, if the system preferences option found under System Preferences General -> Show Scrollbars -> "Automatically based on mouse or trackpad" is set, then scroll bars are always visible in a QWebEngineView, but they are not clickable.

Attached is an example that demonstrates the issue.
The example shows a QWebEngineView with 2 visible scroll bars, which are not click-draggable, until you use a mouse wheel or touchpad to scroll a bit, after which the scrollbars can finally be dragged.

Ideally the scrollbars should either not be visible, like Chrome Browser does it, or they should be clickable.