What's the version of Animate you're using? Try updating it to the latest version (23.0.1) and restarting your computer if you haven't updated already.
Thanks for sharing the link. I am getting the same result at my end. I've asked for help internally. Let me get back to you as soon as I have an update. In the meantime, importing SWF instead of FLA shows the expected result on my end.
This issue has been identified as a bug. Devs are working on a fix. As of now, using the SWF or converting the animation to frame-by-frame animation should help.
Thanks again for reporting it. Feel free to reach out if there are any other questions.