
Theoretically, the only changes they have made to the navmesh don't conflict with each other, and I fail to see how forwarding the unchanged vertices in this particular situation is a bad thing. That is, two mods have altered the same navmesh, but neither one has modified a single vertex that the other has (and the navmesh record shows as green text on a red background). (Unlike the 15EBB example given in the screenshot). One thing I've always been unclear on is resolving navmesh conflicts between mods when neither mod edits the same vertices.
