Supports - why does BS do this and how do I stop it?

In the image see the red circled areas, it wants to print supports in mid air. Why? There is a ledge a few layers higher where the supports should start, instead the software starts them lower in mid air. What setting am I missing? Or is there a defect in the software?

Without the .3mf file it’s very hard to diagnose what is happening here.

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