Recast NavMesh disappear after close editor

Hi,
Recast-NavMesh object disapper after close editor. It again appears after “Build level”. Before 4.3 it works without build level. Is it right or bug?

Wishes,

Its there but its just being rebuilt and losing all settings everytime you open the editor/level. You can press P when navigating the viewport to display the NavMesh. Really these settings should be saved, its really frustrating.