Editor discarding valid navmesh with world composition

1. Create a project, make it use world composition
2. Create a persistent map with a NavmeshBoundsVolume
3. Make it build of sublevels containing NavmeshBoundsVolumes of their own
4. Configure project to use static navmesh generation
5. Build navigation, test it in PIE
6. Relunch the editor, load a map

Result: navmesh is not being drawn (as if it was missing)
Expected: works as expected

Fix UE-51650

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

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I've been trying to follow the demo for Unreal 4 where you create the office but my unreal blanks out and crashes every time I try after I'm a few videos in everytime. It gives me a large error list everytime

I've been trying to follow demo for Unreal 4 where you create office but my unreal blanks out and crashes every time I try after I'm a few videos in everytime. It gives me a large error list everytime

An error occurred while trying to generate project files !?

(UE4-27) Project Crashes