If a VertexInterpolator is used in a material that is applied to a landscape the material will fail to compile.
Found in 4.20 CL# 4369336, 4.21 CL# 4.21 CL# 4613538, 4.22 CL# 4681912
Steps with project:
The landscape material will fail to compile and revert to the default material
The material would compile and appear on the landscape
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-68083 in the post.