I’ve been leveling my Core masteries and noticed something: when your mastery XP bar fills up, the game doesn’t prompt you to spend a point. What’s (much) worse, you stop earning XP, apparently. Cause when I finally noticed that the bar is full and spent a point, the bar reset to 0 / 1,XXX,XXX.
Either prompt us when the bar is full or add XP “overflow” like we have with normal leveling.