After creating a site or terrain and saving the project, the terrain disappears when the project is reopened. Although settings—such as painting data—remain visible, the actual terrain geometry is missing.
Even after deleting and recreating it, the same issue recurs upon saving and reopening the project.
The same issue occurs with version 0758.
If I create a new terrain, save the project, and then reopen it in D5, only the terrain settings remain, while the actual terrain model is missing.