What causes hot deserts (like the Sahara) under the ITCZ?

I am trying to fill my world with climates as realistically as possible. In addition to climate science stuff I read on this site, I've been using these two maps of the Earth as a comparison for where climates appear in relation to the ITCZ:

One thing is super confusing to me, though - the Sahara/Arabian deserts. Unlike western Australia, which is under a high-pressure area and receives no rain year-round, the Sahara and Arabia are both under the ITCZ during half the year. And, according to these maps they should be getting some rain from Atlantic winds. Why do they receive so much less rain than the African savanna?

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What causes hot deserts (like the Sahara) under the ITCZ?

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