After disabling Static Lighting, shadows only render for Tessellated Landscape when being selected in the World Outliner instead of rendering all of them regardless if it is selected.
Tested in 4.22 (CL - 5159901), 4.23 (CL - 5318236)
Expected: All of the LandscapeProxys should have their shadows showing
Result: Only the selected LandscapeProxy is rendering shadows
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-71122 in the post.