I was playing around with the Xp system when I managed to make the Xp bar disappear. Oddly at 2,140,000,000 Xp levels, the Xp bar reappears again and if I add 428,000,000 more Xp levels after that, the Xp bar resets to 0.

Reproduce

• Do /xp add @s 428000000 levels
• Keep doing that until the XP bar disappears
  Notice that the bar disappears