We are trying to configure a card form for the Portal Comment so we can change which fields display on the timeline. We've followed the instructions here - https://learn.microsoft.com/en-us/power-apps/maker/model-driven-apps/set-up-timeline-control#customize-a-card-from-within-timeline - but have found that regardless of what field we add to the Header, it is always the Owner field that will display on the timeline.
This is our card form for the Portal Comment showing the Subject in the Header.
The form configuration shows that it is picking up the Subject in the header, along with the Description in the body.
But this is what is displayed on the timeline.
Is this expected behaviour? Will the Owner of the Portal Comment always display in the title of the record of the timeline or is this a bug? We have tried a number of different fields and the label will update correctly but the value will always show the Owner.

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