Consider adding a query limit to Finder, improve test coverage

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What does this MR do and why?

This is a follow-up issue for the MR.

• Consider adding a LIMIT to the query in Finder. See !178824 (comment 2343766181).
• Improve test coverage. !178824 (merged) failed due to test coverage. Let's review it once again.

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• Related: #507268 (closed)

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