I've realized that if you click the "X" in the upper right of planet and ship windows, it updates GL on what you did. So if you have a purged planet still showing up in your planet tab, click on it and click the "X" for your scans to update.
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I have suggested 7 Races, 5 Organizations, 3 locations, 3 materials, and 20 planets.
View my profile interests for a full list.