Landscape Grass No Longer Casts a Shadow with "Use Landscape Lightmap" Enabled. Working as expected in 4.20 CL# 4369336 and 4.21 CL# 4753647
Found in 4.22 CL# 5660361 and 4.23 CL# 5779284
Landscape grass does not have any lightmap but uses volumetric samples which results lower quality shadows.
Grass would be casting a shadow.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-72498 in the post.