Rests in additional voices

Why does Dorico still show additional rests in other voices when “Bar rests in additional voices” is set to “Omit Rests”?

Is it because Up-Stem Voice 1 is the first voice, and so non-additional?

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What happens if you swap the voices, Ben? Do the rests disappear?

Strange. I have ‘Bar rests in additional voices’ set to omit rests and I get different results.

It’s definitely that upstem voice 1 is (as is usually the case) the primary voice, and as such it will always show rests - it’s not an “additional voice”, so that Notation Option won’t affect it. What I’ve never quite pinned down is the set of circumstances in which the primary voice changes midway through a flow.