Deployment from ap-northeast-3 (Osaka) fails

[shellraiser]

Heads up. Deploying a stackset from within the ap-northeast-3 region fails with Template format error: Unrecognized resource types: [AWS::CDK::Metadata]

I've reached out to AWS support to request assistance and found that they do not plan to add support for that anytime soon:

"I have been told that while the regions ap-northeast-3 and ap-southeast-3 will eventually get added, there are no timelines.
This has been classified as a low priority issue as this resource is effectively used by CDK for telemetry and analytics and there should be no reasons to use it."

Might be something that the internal team developing this construct can help escalate.