Disclaimer: ignoring Behaviour Trees and AI Controllers, here we’re going for a somewhat simplistic approach
- this is my resource actor:
Ensure to disable this for now on both the harvesters’ and resource actors’ colliding components. Otherwise you’ll end up with gaps in the navmesh the AI may be unable to reach. You can address this later if it ever becomes a problem.
- this is my harvester:
Apologies for the garbage quality of the text in the comments above 
it’s a forums upload limitation.