I wonder whose ice cream powder you are using? I used to make ice cream with Penglai Pavilion brand family ice cream powder at home, and there was ice residue.

I asked the customer service online and told me that it was probably because ice cream powder didn't have enough stirring time or standing time, which led to bubbles in the slurry, and ice slag would appear if the powder and water were not fully mixed.

I hope I can help you.