We're updating the status of this idea to more accurately reflect its current status with our engineering team and also made slight changes to the subject line in order for it to be more easily found. We don't have an update to share and can't guarantee a commitment to deliver on this feature request but it should indicate some awareness that we have heard your feedback and could be taken under consideration for a future release.
In the meantime, to avoid the preheader showing, you can manually post your campaign to Facebook using the permanent URL.
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