naturalRegeneration can disable to Regen status effect

I'm creating a custom map and I wanted to turn naturalRegeneration to false, then have an area where you can stand and get a regeneration effect. But whenever I turn naturalRegeneration off, the regen effect given by the regen station doesn't work anymore. The effect still appears, but it doesn't heal me at all. Turning naturalRegeneration back to true allows the regen to work.