Fails to show optional interface methods as such

[vitaly-t]

I have an interface like this one:

export interface IDefect {
    transform(value: any, args: string[]): any;

    getDefaultFilter?(filter: string, args: string[]): any;

    filters?: { [name: string]: IFilter };
}

In TypeDoc it comes up as follows:

Above, optional property filters is shown correctly, as optional, with ?, but for optional method getDefaultFilter symbol ? is missing.

It is only in details the method gets OPTIONAL label attached. But why ? is removed from methods in the interface, while preserved for properties? This is inconsistent, and looks like a bug.

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Used TypeDoc version: 0.28.10