Tonberries have Auto Regen?

So, I've been doing some GoV in Den of Rancor, and I've noticed that all the Tonberries seem to have Auto Regen. I don't remember them having it before, and I looked around online and don't see it mentioned anywhere. Is it a recent glitch or something? I didn't check Tonberries in other areas, but the ones in Den of Rancor definitely have it. And it's not a Regen buff from say, a Tonberry's Elemental, because they have it from the moment they pop, and nowhere near any Tonberries with light elementals.

Did they always have Auto Regen and I'm just out of my mind?