[Problem/Bug]: WebView2 is not appearing in VS 2017 toolbox

What happened?

I have installed Microsoft.Web.WebView2 1.0.2592.51 into my existing project in VS Community 2017 (version 15.9.60), and it shows as installed and appears in the list of project references, but I cannot get it to appear in the toolbox.

I've checked this, it's correct: "In Visual Studio 2017, by default, WebView2 isn't displayed in the Toolbox. To enable WebView2 to be displayed in the Toolbox, select Tools > Options > General > and set the Automatically Populate Toolbox setting to True."

I've rebuilt the solution, closed and re-opened VS, but still no luck.

Importance

Moderate. My app's user experience is affected, but still usable.

Runtime Channel

Stable release (WebView2 Runtime)

Runtime Version

No response

SDK Version

No response

Framework

Winforms

Operating System

Windows 10

OS Version

19045.4651

Repro steps

As per "What happened".

Repros in Edge Browser

No, issue does not reproduce in the corresponding Edge version

Regression

No, this never worked

Last working version (if regression)

No response

No repository files, tests, or entry points are named. Reproduce the issue with Microsoft.Web.WebView2 1.0.2592.51 in a VS Community 2017 WinForms project, checking the reported Toolbox setting, and determine what evidence or documented fix would establish that the WebView2 control appears.