File updates done with Cordova File Plugin don't reflect changes immediately

Ionic Framework ionic-v3
1

Testing it on iPhone X Simulator

Writing to a file and reading the file immediately after write as below:

this.file.writeFile(this.file.dataDirectory +"masters.json", JSON.stringify(jsonData), this.writeOptions)
      .then((saved) => {
        console.log(saved);

        return this.http.get(this.file.dataDirectory +"masters.json")
        .toPromise()
        .then((response) => {
           return Promise.resolve(response);
         });

      })
      .catch((err) => {
        console.log(err);
        return Promise.reject(err);
      });

But, When File is read it shows old File data. After few random restarts the file will reflect new changes.

Same code works perfectly fine on Android.

Any solution?