Mat, that's generally an indicator that the gas struts are carrying too much pressure for their allocated task.
Bonnet struts don't need a great deal of pressure in them; otherwise they basically become a load point like yours have done.
This kind of damage is super common on Alloy, Fibreglass & Carbon Bonnets.
The Strut re-gas guys can set strut pressure to suit particular appilcation; this will prevent a repeat performance.
I've had hatch struts gassed at a higher pressure to allow for a rear wing before.
I think this guy will be the closest to you? They are mobile; so they come to you.
Strut Re-gas Hunter
Arie Oosterveen
Cnr Church & Foundry St
Wickam NSW 2293
Ph: 02 4961 3255