I have only been canning for a couple years, but I have not had any issues as a result of applesauce or apple butter with some bubbles. Interested to hear what the really experienced folks have to say.
Next time you can try putting a dab of butter in. I'm talking teeny tiny. It helps reduce frothing. I always have to do it with jam. I haven't tried making Apple butter, but I've made jam and had that happen. Didn't hurt the jam, just looked funny to me. And a pea sized amount of butter fixed it. Its what my canning book recommended.
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