“Used with Landscape” is no longer necessary.
We made some changes to tessellation for Landscape in 4.13. It should be unnoticeable, but we’ve had a couple of reports of invisible landscape components. Can you try removing your material from the landscape and re-applying it to see if it helps?
Did you apply a non-tessellated material to the landscape and the edit it, or did you make the material tessellated and then apply it to the landscape?