Export a object with comment ,but the comment is missing after build a *.d.ts file

I export an object,then I build to a declare file like index.d.ts,but the file has no comment about that object.

Source code

//src/cache/index.ts
import * as  localStorage from "./localStorage"
export default {
    /**
     * This is a comment2
     */
    localStorage
}

//src/index.ts
import cache from "./cache/index"
export default {
    /**
     * This is a comment1
     */
    cache
}

Index.d.ts

declare const _default: {
    /**
     * This is a comment1
     */
    cache: {
        localStorage: typeof import("./cache/localStorage");//#### This field's comment is missing ####
    };
};
export default _default;

Reproduce the declaration build from src/index.ts and src/cache/index.ts, then compare the generated index.d.ts with the source comments. Trace the declaration-emission path for the nested localStorage property; done means its comment is preserved in the generated declaration file.