Hey Mike,
Thanks for following up! I just tested importing the event you point out from Facebook an the image is import and set correctly. Moreso I run the import several times and the image is not going away.
I’m curious if this is working for new events but not updating existing events without the featured image. Do you notice the same behaviour for new events? I mean imported after 4.3.4 was installed.
Can you please let me know what’s your setting for ‘Event Update Authority’ in WP-Admin > Events > Settings > Imports?
Maybe this has to do with your Update authority setting? If you can check this setting it will help troubleshooting the issue!
Thanks a lot,
Nico