Filter Alerts by data_stream.namespace

Hi All,
I'm trying to filter alerts with KQL using "data_stream.namespace" in Security -> Alerts but no results.
Even using "Group alerts by" with "data_stream.namespace" gives no result.
But the field is visible and populated correctly.
If I run the same query on Analytics -> Discover I see the logs.

I use version 8.9.2 in the cloud.

Thank you

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