Some scenarios are configured to allow purchase of new units with default experience for example 200.
But upgrades are not currently affected. So a unit with 1 xp upgraded here will still have 1 xp.
The unit could be sold and repurchased to get the xp advantage. But if it was an original core unit or prototype, it will lose this status and be counted toward the cap.
Suggestion: Provide same default xp to upgraded units (perhaps OG Mode only).