"$had_persisted_distinct_id" what is

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I apologize, but I don't have any specific information about a property called "$had_persisted_distinct_id" in Mixpanel from the provided knowledge sources. This property is not mentioned in any of the documents I have access to.Mixpanel does use various reserved properties for identity management and tracking, but this particular property is not listed among the reserved properties or default properties in the documentation I have.If you're seeing this property in your Mixpanel data, it might be a custom property specific to your implementation or a property used in a newer version of Mixpanel that isn't covered in the provided documentation. For the most up-to-date and accurate information about Mixpanel properties, I recommend checking the official Mixpanel documentation or contacting Mixpanel support directly.

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