I seem to have solved our problem, or at least found a work around…
In blender, in edit mode, rotate the mesh -90 degrees around the x axis. This way the y axis points upwards in the same way as it is in jme3. Then, in object mode, rotate it 90 degrees around the x axis to have it look the same way as before. After this, it will work as expected.
I’m not certain if this behavior is intended. My initial guess would be that local and global orientations got mixed up. Perhaps someone with more knowledge on the blender import can answer that?
The issue is definitely with the blender import and not the physics though.
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