Materials with normal maps will have Y-flipped normal maps on mirrored faces.
I would just try to avoid mirroring things entirely if it weren't for the fact that 3 faces are by default flipped. (i need to select these faces individually and apply -1 scale for y and rotation to 180 to correct it)
Not sure if this is something tbloader can even fix, but worth a shot.
Materials with normal maps will have Y-flipped normal maps on mirrored faces. I would just try to avoid mirroring things entirely if it weren't for the fact that 3 faces are by default flipped. (i need to select these faces individually and apply -1 scale for y and rotation to 180 to correct it) Not sure if this is something tbloader can even fix, but worth a shot.