Some things were a bit painful to debug. Looks like the tile stitching needs to be redone at some point in the future. As you can see in the above picture, the navmesh is missing a detail mesh. I have an idea how to make a semi good detail mesh really quickly.
Anyways, once I check in the stuff it means that Detour and Recast APIs will change a bit. I will write migration guide once I have polished the code a bit.