[BUG] INSTANCE_PROFILE_NAME is empty because no prefix matches

[ysdongAmazon]

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Describe the bug
in eks iam policy attachment GitHub examples, seems INSTANCE_PROFILE_NAME is generated empty because the right ec2 instance profile name does not start with eksctl-appmeshtest-nodegroup-ng (INSTANCE_PROFILE_PREFIX here).
I can make it work by manually attach the iam within console, just not sure it is only a special case for me or bug in the instruction.
https://github.com/aws/aws-app-mesh-examples/blob/main/walkthroughs/eks/o11y-xray.md

Platform
EKS, ECS, EC2, etc.

To Reproduce
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Expected behavior
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Config files, and API responses
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Additional context
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