I’m not sure if it’s EWWW alone or in conjunction with other plugins. After deactivating EWWW, Fusion Builder was usable again. However, additional faults occurred in the media library. This was eliminated by deactivating other plugins. I suspect WP SuperCache.
These problems do not occur with the standard Twenty-Two theme.
So it is possible that it is not due to Avada alone, but in interaction with other plugins and Avada. In any case, it’s quite tricky.
Many greetings