It's an on-going problem with "body-on-frame" construction because of the huge difference in strength between the body and the frame.
LR products, not just Defender, do have better crush-zones to absorb energy but it's not easy to achieve.
When LR first put driver/passenger air-bags into the Range Rover, they found they had to do far more engineering than they expected as the early prototypes with air-bags failed their crash tests badly - the frame stopped so suddenly that the inertia forces of the driver/passenger were so great on the air-bags that the air-bag mountings smashed the front bulkhead before they'd finished their job.
After the necessary engineering changes, all was well, but a salutary experience.
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