Lots of empty fields in expanded document view

This behavior seems fairly new with a recent kibana or other update - when looking at the expanded document for an item in the discover list I see lots of empty fields.

Apparently these are “date_time” fields that kibana adds to the “docvalue_fields” parameter to queries:

"docvalue_fields": [
    {
      "field": "@timestamp",
      "format": "date_time"
    },
    {
      "field": "aws.cloudtrail.user_identity.session_context.creation_date",
      "format": "date_time"
    },
    {
      "field": "azure.auditlogs.properties.activity_datetime",
      "format": "date_time"
    },

There is some discussion of this here: Kibana using docvalue_fields for no apparent reason

But I’m not sure why these fields are being displayed in the results.

This has been marked as a bug: https://github.com/elastic/kibana/issues/68672

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