Lightmass Crash assets missing

I’m currently testing 4.19 with Datasmith for archviz. I ran my 3rd light bake, light mass never got passed 0% everything froze up and I had to restart. When I reopened the scene most of my assets are missing. Is there a fix for this?

It sounds like the project may not have been saved prior to the freeze and restart. You can check to see if there was an auto-save by looking in the Saved > Autosaves folder under the project directory.