fix(core): NestedStack defaultChild is undefined

[Jacco]

fixes #11221

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[gitpod-io]

[rix0rrr]

Thanks!

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildProject89A8053A-LhjRyN9kxr8o
• Commit ID: 60acc21
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).