I have a Nav Mesh Bounds Volume in my project, it used to be fine and wouldn’t cause me so much trouble in UE 5.1, but after migrating to UE5.6 the Nav Mesh keeps getting invalidated on its own. So after pressing P in the editor I see no green indicator for the Nav Mesh existence and even after building paths it doesn’t come back until i delete and re add it a couple of times.
Have you find any solution, i have got same issues. I tried so much but nothing change.
Yes, I found a temp. solution and I like to share it for others who will run into Nav Mesh disappearances.
It has to do with rebuilding navigation again and again, and eventually if it’s built too many times it will disappear.
The thing is if your moving or putting items inside the level and dragging them around the NavMesh is updating all the time and rebuilding. And then it just disappears.
I found a setting which disables auto-building of navmesh:
Edit > Editor Preferences > Level Editor > Miscelleanous > Editing> “Update Navigation Automatically“
I unchecked it and now i build navigation manually when i need to just when i am about to push an update.
Although, it still disappears and i ahev to add all the NavMeshes again.
Another thing I have done is copy/pasted all the Transform parameters of the NavMesh and saved it in a file. When it disappears and I re-add it, i simply copy paste the parameters.