It gets over extended when the internal shock absorber fails so that it no longer limits the downward extension of the strut. You need a new strut to fix it, regardless of any damage to the air bag.
Mine had more damage than yours when it over extended the front left so you are lucky. They might find more stuff when they do the work, though.
				
			 
			
		 
			
				
			
			
				Bob
2010 D4 3.0TDV6 SE, ediff, LLAMS, 5 x GOE wheels, LT285/60R18 BFG K02's, GOE Compressor Guard, LR Tank, Mitch Hitch, ECB Bull Bar, Kaymar Rear Bar, Traxide, Safari Snorkel.
2019 Discovery 5 SD6 SE, 20 inch wheels, 275/55R20 Nitto Grappler G2 tyres
			
			
		 
	
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