Point lights don't cast volumetric shadows from meshes with materials with tessellation, even if tessellation multiplier is 0.
Found in 4.19 CL# 4033788, 4.20 CL# 4302132, 4.21 CL# 4347190
The cube with the tessellated material will not cast any shadow
The tessellated material will cast a shadow
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-63805 in the post.