Quote - Here's the mat I made for this test. Just replace the rocks with trees and see if it works. If it does, you can study it to see what's the difference. If it doesn't... well, I don't know...

As you can see, your material works perfectly on my terrain - not a straggler in sight:

And you are right - I will study your material settings.  Thank you very much!  This is very kind of you.