Help!!! Variable Aggregator shows invalid variable, causing workflow to fail to publish

Help Me Build Seeking help
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Workflow A, copied version is Workflow B

Problem: The original workflow had no issues, could be published, and had no warnings. However, the copied B, which is identical to Workflow A, displays an invalid variable warning for the aggregation variable, preventing publication, but it can run. Why??? How can I solve this? Seeking help.

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Solved, but it feels like a bug. I just copied it directly. Hope some expert can provide an explanation/solution based on this.

Temporary solution: Delete and re-add this Aggregator Node.

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