Changing LODBias on landscape sections causes a grass type placement issues. The grass will be floating and rotated incorrectly.
Found in 4.18 CL# 3832480, 4.19 CL# 4033788, 4.20 Preview 1 CL# 4112139, 4.21 CL# 4101872
The Grass type will be placed up in the air spread out everywhere
Grass Type will be placed properly as you paint
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-60061 in the post.