it could also be in your export settings. for some reason, certain export settings automatically set Z+ as the forward axis rather than the vertical axis
For blockland you should use +X forward and +Z up instead
The settings should be toward the bottom left (may need to scroll down) when you go to export the model
book (View in 3D)
Does your model have a mountPoint node? I think to add the node, you need to add a single arrow (Shift + A > Empty > Single Arrow) and name it 'mountPoint'