wow, I didn’t expect you to do the effort of making a video about it. Thanks man.
While this is a viable solution if I just wanted to “merge” two terrains together, I think it is not an entirely viable solution if you have a tiled terrain that you want to import from World Machine.
But thanks it gives me a possible solution.
I will keep investigating and if worse comes to worse I will have to offset my terrains to overlap like yours and do the manual fixup.
If I ever find a solution I will make sure to post it here.