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Type:
Bug
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Resolution: Unresolved
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Priority:
Major - P3
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Affects Version/s: None
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Storage Execution
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ALL
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Storage Execution 2026-05-25
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Similar to SERVER-124383 and SERVER-123599: gContainerWrites is an FCV-gated feature flag. FCVGatedFeatureFlag::isEnabled combines the flag's _enabled boolean with an FCV comparison, so a setForServerParameter(true) at startup flips _enabled but does not bypass the FCV gate. During the window between a binary upgrade to 9.0 and the subsequent FCV upgrade, the flag therefore reads as off even when configuration requires it to be on.