Auth code not cleared after login, second authorization attempt fails

Q&A (please complete the following information)

• OS: Windows 10
• Browser: Chrome
• Version: 81
• Method of installation: nuget (Swashbuckle.Aspnetcore.Swagger)
• Swagger-UI version: 3.25.0
• Swagger/OpenAPI version: OpenAPI 3.0

Describe the bug you're encountering (includes steps to re-produce)

1. Users clicks on 'Authorize' button
2. OAuth pop-up shows and user clicks on Authorize.
3. Login succeeds, pop-up now shows the 'Logout' button.
4. User logs out
5. Without closing the OAuth pop-up user tries to authorize again
6. An error is returned, something like "error: invalid_grant, description: Authorization code is invalid or expired."

Expected behavior

User should be able to authorize/logout/authorize/etc in the same pop-up.

Screenshots

Unfortunately I cannot upload the screenshot at the moment. The error appears in the OAuth pop-up, in a red banner above the 'Authorize' and 'Close' buttons.

Additional context or thoughts

I've yet to verify my hypothesis but I suspect that Swagger UI is not clearing the auth code upon logout. So when the user tries to re-authorize, in the same pop-up, Swagger re-uses the auth code, which is only good strictly for one request (the first one).

Start at the Authorize button and OAuth pop-up flow described in the reproduction steps, then inspect what happens when the user logs out without closing the pop-up. Reproduce the authorize/logout/authorize sequence in Swagger UI 3.25.0 with OpenAPI 3.0. Done means repeated authorization succeeds in the same pop-up after logout.