[WIP] Update fetchMemberCounts to address feedback

[Copilot]

Thanks for the feedback on #11352. I've created this new PR, which merges into #11352, to address your comment. I will work on the changes and keep this PR's description up to date as I make progress.

Original PR: #11352
Triggering review: #11352 (comment)

@copilot Doesn't counts.first and counts.firstKey need to be flipped?

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch copilot/sub-pr-11352

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