Cubik Studio

I'm having trouble exporting my projects to OBJ files. The generated files work in some applications (tested in Windows Mixed Realtity/ 3D viewer thing and Blender), while others cannot process it (namely Minetest which uses the Irrlicht engine). I tried all voxel->element options with and without optimized faces. When importing the generated OBJ in Blender and immediately exporting it back to OBJ, the file is fixed. This happened to me with two meshes...

I already opened an issue on Minetest's Github repo, but I wonder how stable the OBJ exporter really is. Did anyone else have problems using the generated files? I need to find out wether this is a problem with Minetest, Irrlicht or Cubik Studio.

I attached the cubik and obj files in case anyone wants to take a look at them.

I can't even export to obj, it always take over the RAM crash my PC when I try to do so.

What would be useful is the OBJ exported from Cubik and the OBJ "fixed" by Blender you are talking about...

Btw, Cubik Studio strictly follows the OBJ specifications.

Edit: FYI the OBJ file you attached (which is the Cubik export) is flawlessly opened by "Paint 3D" from Windows 10