Sorry for the delay. I responded to this but apparently it didn't post.
The issue may be that your area has not been processed yet and it is doing it on demand. It may take a minute or so to generate the data if there is a lot of other new data being processed at the time.
Please draw your polygon or edit it and then wait a minute or two before hitting opening the Terrain Awareness panel.
It isn't really an issue of it needing to be closed and then reopened. It is just a delay in the data being available. So if you wait a bit it should show up fine.
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