Buttons not working correctly in Animate CC 2019

I've encountered issues with the functionality of buttons in Adobe Animate CC 2019 (Build 326) and am curious if anyone else is having the same problem or knows how to resolve the issue. What I've found is that if I create and add AS3 script for a button, it works fine if it is on the first frame. If you move the button and accompanying frame script off of the first frame, to say frame 2 or 10 or 20, it fails. Sometimes it throws an "access of undefined property buttonInstanceName" error (even though the button is correctly named and present on the same frame as the script) and sometimes it makes the rollOver states wacky and ceases to function. Strangely, when I open old projects in 2019, they function fine. But, if I copy the layers from an old project to a new document created in 2019, it fails. I can't figure out what is going wrong and any advice/assistance would be appreciated.  I made this video documenting the issue if you'd like to see what I am talking about: buttonProblems - YouTube