fix: judge next dirent cache type

[XiSenao]

Description

fix: #15784

Additional context

If I understand correctly, we need to determine the type of the next Dirent here.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines, especially the Pull Request Guidelines.
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• Update the corresponding documentation if needed.
• Ideally, include relevant tests that fail without this PR but pass with it.

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[patak-dev]

Ouch, good catch @XiSenao! Thanks for fixing this!