Known limitations

Closed rings around very tight curves can self-overlap

The self-intersection cleanup is skipped for rings, because their inner and outer loops need matching vertex counts to build the walls.

Nav modifier edges stair-step

Recast marks navigation areas per voxel with no contour simplification (unlike solid geometry, which is simplified).

Workarounds:

• Set Nav Mesh Resolution to High on the volume to halve the step size locally.
• Or lower the navmesh's Cell Size globally.

See Nav Modifier volumes.

The navmesh re-bakes continuously while dragging

This affects any nav-relevant volume being dragged. It is standard UE behaviour for any actor that affects navigation; the global Update Navigation Automatically setting controls it.