After clicking 'Create StaticMesh' button on an Procedural Mesh Component, and saving the mesh, the created mesh has bad tangents. Included in the attachments, is a test project with a parallax material to identify the difference between a Procedural Mesh and it's Static Mesh counterpart.
Result: Take note of the behavior of the materials on the static mesh actor, it behaves differently than ProcMesh by shifting on the sides. (See ProcStatisMesh.Gif)
Expected: Static Mesh is created without need to recompute tangents.
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-65798 in the post.