cut_face_id/name Assignment Bug of CutMeshByPlaneGenerator

[miaoyinb]

Bug Description

If the input mesh has elements with their faces on the cutting plane, not element cutting is needed for these elements. In that case, the cut_face_id and cut_face_name are not assigned to these pre-existent faces on the cutting plane, which is not the preferred behavior.

Steps to Reproduce

[Mesh]
  [gmg]
    type = GeneratedMeshGenerator
    dim = 3
    nx = 2
    ny = 2
    nz = 2
    zmin = 0
    zmax = 0.6
    elem_type = HEX8
  []
  [cut]
    type = CutMeshByPlaneGenerator
    input = gmg
    plane_point = '0.5 0.5 0.0'
    plane_normal = '0.0 1.0 0.0'
    cut_face_id = 100
    cut_face_name = cut
  []
[]

Impact

The cut face boundary would be incompletely defined or even missing.