[Bug]: ValidateRunnerXlangTest$SingleInputOutputTest.test failing for various x-lang test suites

### What happened?

For example,

https://ci-beam.apache.org/job/beam_PostCommit_XVR_Flink/5756/
https://ci-beam.apache.org/job/beam_PostCommit_XVR_JavaUsingPython_Dataflow/787/
https://ci-beam.apache.org/job/beam_PostCommit_XVR_Direct/3008/

Stacktrace
java.lang.RuntimeException: expansion service error: Traceback (most recent call last):
File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_XVR_Direct/src/build/gradleenv/1922375555/lib/python3.7/site-packages/apache_beam/runners/portability/expansion_service.py", line 65, in Expand
ptransform.PTransform.from_runner_api(request.transform, context))
File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_XVR_Direct/src/build/gradleenv/1922375555/lib/python3.7/site-packages/apache_beam/transforms/ptransform.py", line 768, in from_runner_api
context)
File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_XVR_Direct/src/build/gradleenv/1922375555/lib/python3.7/site-packages/apache_beam/runners/portability/expansion_service_test.py", line 113, in from_runner_api_parameter
return PrefixTransform(parse_string_payload(payload)['data'])
File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_XVR_Direct/src/build/gradleenv/1922375555/lib/python3.7/site-packages/apache_beam/runners/portability/expansion_service_test.py", line 349, in parse_string_payload
return RowCoder(payload.schema).decode(payload.payload)._asdict()
File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_XVR_Direct/src/build/gradleenv/1922375555/lib/python3.7/site-packages/apache_beam/coders/row_coder.py", line 64, in __init__
self._type_hint = named_tuple_from_schema(self.schema)
File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_XVR_Direct/src/build/gradleenv/1922375555/lib/python3.7/site-packages/apache_beam/typehints/schemas.py", line 473, in named_tuple_from_schema
schema_registry=schema_registry).named_tuple_from_schema(schema)
File "/home/jenkins/jenkins-slave/workspace/beam_PostCommit_XVR_Direct/src/build/gradleenv/1922375555/lib/python3.7/site-packages/apache_beam/typehints/schemas.py", line 432, in named_tuple_from_schema
assert schema.id
AssertionError

### Issue Priority

Priority: 1

### Issue Component

Component: test-failures