Switching from or to items that change maxhealth do not update health until damage is taken

When wearing armor that reduces player health, more damage can be received than is visible. At three hearts, for example, the remaining seven hearts of the default ten can still be damaged despite not being visible. Additionally, the health bar will at randomly switch from the intended amount of health to the default ten hearts, both visibly and in functionality. Included is the world file and screenshots of the problem.