Why map transforms in object in MongoDB?

I had a problem.

When i create map in MongoDB Example Shop

        guildID: id,
        ownerID: owner_id,
        _premium: 0,
        Moderation:{
            auto:false,
            prefix:'k!',
            muterole:0,
            language: preferredLocale
        },
        Economy: {
            shop:new Map(),
            upXP:100,
            bonus:50,
            money:3,
            xp:5
        },
        options:{
            boxes:false
        }

Its create a object

How to fix it? I use MongoDB(not mongoose)

Copyright Notice：Content Author:「KristalkillPlay」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/67974733/why-map-transforms-in-object-in-mongodb