Reading Fluent mesh warnings and errors

[anskgiannok]

Hi,

I am reading a mesh exported from ANSYS Fluent in .msh format with meshio ("mesh.msh"). I am getting a lot of warnings like these

Warning: Unknown index 4. Skipping.
Warning: Unknown index 11. Skipping.
Warning: Unknown index 11. Skipping.
Warning: Unknown index 11. Skipping.
Warning: Unknown index 316. Skipping.
Warning: Zone specification not supported yet. Skipping.
Warning: Zone specification not supported yet. Skipping.
Warning: Zone specification not supported yet. Skipping.
Warning: Zone specification not supported yet. Skipping.
Warning: Zone specification not supported yet. Skipping.
Warning: Zone specification not supported yet. Skipping.
Warning: Zone specification not supported yet. Skipping.
Warning: Unknown index 38. Skipping.
Warning: Unknown index 60. Skipping.
Warning: Unknown index 73. Skipping.

I actually want to read this mesh via pyVista (which uses meshio library). Although I get these warnings, I cannot perform some cell quality calculations regarding skewness. I suppose that this problem comes from the meshio reading process. The elements are tetrahedrons. I attach the mesh file in .txt format because I am not able to upload a .msh file. How can I compute and display the cell quality based on skewness for this mesh?

mesh.txt

Thank you