The `normal_mesh` function does not help display tetrahedral elements propertly.

[Kevin-Mattheus-Moerman]

As also described over at Tetgen.jl, Makie's normal_mesh function (and/or mesh function) does not help display tetrahedral elements properly. I believe some triangles are skipped. Each tetrahedron should spawn 4 triangular faces to create closed volumes.

[tpgillam]

Skipped triangles sounds similar to #3561, possibly?

[Kevin-Mattheus-Moerman]

@tpgillam I think this is different. I think the faces for the tetrahedral mesh are not correctly treated. I'll respond over at that other issue now too.