There are settings that can cause areas to "disappear". If you post a 3mf Project File (File | Save Project) it would be very helpful.
Is the Outer Wall Inset = 0 ?
Is the Horizontal Expansion = OFF ?
If you try slicing with a smaller nozzle (or line width) - does that area slice?
Is the model watertight?
You're using a 1.0mm nozzle, what is the wall thickness of the "missing" area?
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