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LTM4622 & LTM4622A output voltage range


I'm having a specific question regarding the output voltage range  of the said parts. According the datasheet : 

LTM4622 output voltage range can go from 0.6 to 5.5V 

LTM4622A output voltage range can go from 1.5 to 12V 

My issue is that I used a LTM4622A by mistake to provide a power rail below its minimum output voltage (0.9V & 1.09V)  and didn't get any

problems using after numerous power cycle and a load that can go up to 600mA. 

Is there any explanation to this, and most importantly, could it lead to failure and reduce its life cycle by a fair margin ? 

Kind Regards