PostRelease_NightlySnapshot failing due to missing "region" flag

https://builds.apache.org/job/beam_PostRelease_NightlySnapshot/959/

https://builds.apache.org/job/beam_PostRelease_NightlySnapshot/958/

https://scans.gradle.com/s/tth6vapotb5vw/console-log?task=:runners:google-cloud-dataflow-java:runMobileGamingJavaDataflow

[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.6.0:java (default-cli) on project word-count-beam: An exception occured while executing the Java class. Failed to construct instance from factory method DataflowRunner#fromOptions(interface org.apache.beam.sdk.options.PipelineOptions): InvocationTargetException: Missing required values: region -> [Help 1]

Probably due to https://github.com/apache/beam/pull/11281.

Kyle, can you take a look ?