I have a strange thing after building…have to say, when I build your example map everything works perfect, so its definitely something on my site! 
I have the new Foliage System integrated with MSGT, everything works perfect when running from the editor, but after building, the Update Instance Transform in the Remove Foliage Instance function returns false. For me that’s strange behaviour, because when running in the editor it works fine and the same function returns true. Al the other ‘things’, like converting the instance to blueprint seems to work, als when I cut the tree it false down, but the ‘first’ tree is still standing there…
Maybe someone can throw me a bone where to look at (btw, I’m using UE 4.18.3)
All have a great weekend!