I have the following types in my project:

export interface BaseTravelpayoutsPricesV3Options {
    currency?: string;
    departure_at?: string;
    return_at?: string;
    direct?: boolean;
    limit?: number;
    page?: number;
    sorting?: 'price' | 'route';
    unique?: boolean;
    one_way?: boolean;
}

export interface TravelpayoutsPricesV3OptionsWithOrigin {
    origin: string;
}

export interface TravelpayoutsPricesV3OptionsWithDestination {
    destination: string;
}

export interface TravelpayoutsPricesV3OptionsWithOriginAndDestination {
    origin: string;
    destination: string;
}

export type TravelpayoutsPricesV3Options = BaseTravelpayoutsPricesV3Options & (TravelpayoutsPricesV3OptionsWithOrigin | TravelpayoutsPricesV3OptionsWithDestination | TravelpayoutsPricesV3OptionsWithOriginAndDestination);

Now when I’m trying to omit some property from that type for function argument, tha call says I’m specifiyng unknown property even though it’s not the one I omitted.

function test(options: Omit<TravelpayoutsPricesV3Options, 'limit'>) {
    return 'foo';
}

test({
    origin: 'test', // Object literal may only specify known properties, and 'origin' does not exist in type 'Omit<TravelpayoutsPricesV3Options, "limit">'
})

Why does that happen?