AuthorizationsController does not raise errors when handle_auth_errors :raise is set

[stevetsanders]

I have my doorkeeper config set to api_only mode.

I have this code which I thought would raise an error when a grant is trying to be created with an invalid request (e.g. missing client ID, redirect URI, etc)

class OAuthAuthorizationsController < Doorkeeper::AuthorizationsController
  def create
    auth = authorize_response
    render json: auth.body
  rescue e
    render json: {
             error: e,
             error_description: e.description,
           },
      status: :bad_request
  end
end

However even though I have handle_auth_errors :raise set in the config file, authorize_response is not raising an error but just returning it (the variable auth is an error object).
Looking at the config file I understand that only these errors will be raised

  #   Doorkeeper::Errors::TokenForbidden, Doorkeeper::Errors::TokenExpired,
  #   Doorkeeper::Errors::TokenRevoked, Doorkeeper::Errors::TokenUnknown

is there a way to get errors raised in the AuthorizationsController?