Health boost extra lives not saved

When using health boost and fill up health competently and then quitting the game, when you return EXTRA health resets to 0

How to do:
1. In survival with cheats type /effect "your name" 21 6000 100 (big Health boost)
2. Then fill it with /effect "your name" 10 20 200 (Fast Regeneration)
3. Save and quit map.
4. All the extra health flew away.