I think this device doesn't have the reverse voltage protection, but is this reverse voltage going to be problem?
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What is the applied voltage at Vin and Vout ? Probably, you could be seeing Vin= Vout- 0.4 V as the body diode of the internal FET is forward biased.
Calculate the current that can flow from Vout to Vin through body diode due to loading of other circuits on the Vin rail.
The device can get damaged if there is a continuous current flow of high current in the body diode.