Health does not update when minecraft:generic.max_health is set to 1

When you set generic.max_health to 1 using /attribute, damage acts strangely. When you take damage, you can heal or the death screen may pop up without dying. If set back to 20, the health bar shows that health was never actually set to 1.

Steps to reproduce:

1. set generic.max_health to 1
2.  take damage