Yes, that's right. I tried to relegate my char to lower ranks to get max amount of PVP wins during Legendary Days for getting 5 star Legendary. Seems to be useful because PVP wins gives a lot of points during some daily tasks.
But the history for all other season endings isn't shown anymore.
If that is not an appropriate strategy it's fine. That's why I asked if it is a bug or a feature.
Thanks for helping!