Inconsistent nav mesh resolution?

[BIGTIMEMASTER (Aljav)]

Notice that the area beneath this arch does not allow navigation. Collision wireframe is turned on which indicates that we are using complex collision and nothing is covering that spot:

Within the same area (using the same nav mesh volume) you can see that smaller passages do work correctly. Note here how the navmesh allows travel between the columns:

So I think that rules out an issue with settings, however here is the recast navmesh settings:

Additional notes:

*Not using nanite
*No lods
*No additional collision meshes - just the complex collision as simple is used for this static mesh

Another problem area:
Here the area under the overhang does not receive tiles even though entire area is covered by navmesh volume and the agent height is not too tall.

Anybody got a clue what else I could look at?

[BIGTIMEMASTER (Aljav)]

The issue is related to size of the static mesh. If I break apart the static meshes into smaller chunks (like a few buildings rather than entire neighborhood), then the navmesh is accurate.

This is a problem related to doing level blockout in maya, but won’t be present once the environment art is converted to modular kit.