Those are the rules. I agree with them. There is no reason for an occupying power to not supply food and medical supplies to the best of their abilities in areas under its control. They just need to make sure who is getting it. In my experience, the combat troops do a better job at it than the bean counters that follow.

As the "occupying power", Lord Cameron said Israel was "responsible" and that this had consequences under international humanitarian law.
International law states that an occupying power has a duty to ensure food and medical supplies to the population under its control "to the fullest extent of the means available to it".

Cameron to warn Israel minister over Gaza aid (bbc.com)