I tried everything from the start, and nope, it didn't work.
I tried to open the generated .irr file and all I get is a black empty space in irredit, however, if I start a new scene, erase the default cube and skybox and try to add the generated .irrmesh as a mesh, the log says it's loading the scene with textures and everything, but when it loads it is a totally white mesh:
Yet, if I try to load the same mesh with the same lightmaps generated in blender but as a b3d file it loads fine:
there must be something not being read fine by irredit or not exported properly in blender-irrb.
Can you please try loading your generated scene in irredit?