No problems, just as well really, just a few hours after I decide to publish it for free I discover the Epic are working on a HTN plugin themselves 
I’m sure that’s going to be far better than anything I can manage in my free time.
There’s a bunch of useful code samples in there regarding plugin settings, custom BP pins, detail customization etc. which took me a while to figure out even if the planner itself is rapidly superceded by Epic’s implementation 
HTN and GOAP are somewhat different approaches but I expect anyone wanting a planner is going to go with the engine version. I’ve learned a lot of stuff about UE while doing this so it’s not wasted effort!