This answer is short and sweet. If you end up not having any NavData in your AI debugging widget, can see the dynamically generated navigation mesh and your AI isn’t paying attention to it, you may need to tell the Unreal engine to actually use the runtime generated navigation mesh (dynamic “Recast Nav Mesh” actor), as default.
This is done in the Project Settings, under Navigation Mesh, ensure “Can be Main Nav Data” is checked. If it isn’t, Unreal will disregard your recastNavMesh.
This is a post I found, with the exact answer, just moments after I found it myself through using the AI debugger: