Generating Grant Token Documentation says 'state' param should be returned, but not is returned

Generating Grant Token Documentation says 'state' param should be returned, but not is returned

Trying to follow this documentation:
https://www.zoho.com/invoice/api/v3/oauth/#overview

Under the heading "Step 2: Generating Grant Token" it says:
"Upon clicking “Accept”, Zoho will redirect to the given redirect_uri with code and state param. "

But I get redirect URL like this:
https://www.example.com/?code=1000.xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx=us&accounts-server=https%3A%2F%2Faccounts.zoho.com

There is no `state` parametrer in it. Is the documentation wrong, or am I doing something wrong?