Samples rendering "No operations defined in spec!"

[CharlieDigital]

I cloned the repo and ran the V3IoC sample from the terminal (VS Code).

My functions version info:

Azure Functions Core Tools
Core Tools Version:       3.0.3568 Commit hash: e30a0ede85fd498199c28ad699ab2548593f759b  (64-bit)
Function Runtime Version: 3.0.15828.0

SDKs:

I start the runtime via func start:

samples\Microsoft.Azure.WebJobs.Extensions.OpenApi.FunctionApp.V3IoC>func start

And I can see the endpoints registered correctly:

When I load the UI in the browser, I get the following:

swagger.json behaves similarly:

All of the samples behave the same way.

Am I missing something really obvious?

[CharlieDigital]

Closing because this looks like a duplicate of #172