Issue with After Effects mask expansion


I have created an animation in After Effects with a cut out ellipse mask moving around the screen which eventually expands. It works great in After Effects but when I try to convert it to a Lottie file the expansion doesn’t work correctly. As the circle expands there is a second, non-transparent ring inside.

You can see the video on YouTube and the red circle is the transparent mask.

This is the Lottie

Can you share the link to the lottie so I can compare?