Auth0 respones mode form_post

I am testing with this against my dotnet mvc server for integration testing.

PORT=4000 npx auth0-simulator --standalone

The error

Error: Assert condition failed: unknown response_mode form_post

and the code

            let responseMode = ((_a = req.query.response_mode) !== null && _a !== void 0 ? _a : 'query');
            (0, assert_ts_1.assert)(['query', 'web_message'].includes(responseMode), `unknown response_mode ${responseMode}`);
            let handler = authorizeHandlers[responseMode];

seems to imply that this simulator doesn't support form_post as a response mode for authorization_code flow?

Is there something I am doing wrong here?

Start the standalone simulator with PORT=4000 npx auth0-simulator --standalone and trace authorization handling from the response_mode query parameter to authorizeHandlers. Confirm the expected behavior for form_post and add support if required, with coverage for authorization-code requests using that response mode.