Official comment
We are sorry to hear that the Google Earth part of your workflow isn't working anymore. In our efforts to increase the compatibility of what is created by Map Pilot Pro for use in DJI Fly we had to change the format of the KMZ that gets created. In the newer versions of DJI Fly the KMZ files DJI creates have the KML files in a folder called 'wpmz'. This is part of their standard. We are trying to duplicate it exactly as they do it so certain aspects of the files will go more smoothly between the apps. This may have affected the ability to open it in Google Earth but Google Earth compatibility is not part of our goal.
I do not currently have any workarounds for you since we are just trying to match what DJI does and their format doesn't seem to work in Google Earth either.