Issue with "ValidateErrorResponseFromAuthorizationEndpoint" test case

When going through this test case at [1], it seems we are validating the parameters against the parameters specified in [2]. The test case fails, if the response contains additional parameters. But specification at [2], does not state, that there shouldn't be additional parameter in the event of error. In that case, even if there are additional parameters from the server, shouldn't this testcase be considered as passed?

[1] https://gitlab.com/fintechlabs/fapi-conformance-suite/blob/master/src/main/java/io/fintechlabs/testframework/condition/client/ValidateErrorResponseFromAuthorizationEndpoint.java#L33 [2] https://openid.net/specs/openid-connect-core-1_0.html#AuthError