Splines on a tiled terrain?

Been posting about this on the forum for a few weeks with no joy, hopefully someone here can help, sorry for bothering you!

It would appear, that if I import a tiled terrain from world machine, I am unable to place terrain splines using ctrl + LMB when the tool is selected.

Is this expected behaviour for now? if so, is there a work around?



Same here can’t create new landscape splines on my tiled terrain .need help thanks