Nav Mesh Bounds Volume not working with World Composition Landscape

I have a “Nav Mesh Bounds Volume” in my scene that used to work fine in the UE4 Editor, however when I started using World Composition (to piece landscape tiles together), it stopped working correctly for some reason? I’m not sure if it’s directly related to using World Composition or not though.

The Navmesh bounds volume is 60 x 60 x 20 (x,y,z) in scale. And I made sure it was intersecting the landscape at all points of the volume (so it goes beneath the landscape even). When I play the game, only about 3 or 4 of the navigation tiles are “green”, meaning they can be walked on. All of the other tiles don’t show up at all (like they’re not detected). I’ve tried deleting the NavMeshBoundsVolume and re-inserting a brand new one, but that didn’t work either. About 70% of the nav mesh area is simply not detected in the game. When I’m done playing the game though (in the Editor), it shows that the entire Nav Mesh Bounds area is correctly calculated again (i.e. all walkable). It’s just when I play the game that it doesn’t work.

I did recently “upgrade” the editor from 4.19.1 to version 4.19.2…….so maybe something in that little version change broke something?

Overall, I just can’t seem to get the Nav Mesh Bounds volume to work over the entire volume, and I don’t know what else to try. Thanks for any tips or help.