I add a key to the object, when I log it on console it is there with the other 2 keys
But it is not recognized in object.keys() and I can't reference to it in any way,
it is the key states in equipmentObj

fetch('data/equipmentStateHistory.json')
.then(res => res.json())
.then(json => {
    for (let i = 0; i < json.length; i++){
        for(let j = 0; j < equipmentObj.length; j++){
            if(json[i].equipmentId === equipmentObj[j].equipmentId){
                 
                **equipmentObj[j].states = json[i].states;**
                /* console.log(json[i].states) */
                /* Object.assign(equipmentObj, {key3: json[i].states}); */
            }
        }
    }
})

Here is the console with the two keys recognized
under is states as the 3rd key, which i cannot reference to use in the code
console_img