Flutter web: Values retrieved from Firestore map are truncated when added to List

In my Flutter Web application I am retrieving values from the map timeslots in Firestore.
This is what the data looks like:

But, instead of retrieving the whole list of values, I get a truncated list like this:

[Mo-Washing-(09:00-10:00, 10:00-11:00, 11:00-12:00, ..., 20:00-21:00, 21:00-22:00)]

Below I have included the 2 functions responsible for retrieving the data and adding it to the list object

static List object = [];
static Map<String, dynamic> timeDetails = {};
static Map<String, dynamic> userDetails = {};

  checkExists(docuID) async {
    return await firestore()
        .collection('environments')
        .doc(docuID)
        .get()
        .then((val) {
      userDetails.addAll(val.data());
    }).whenComplete(() async {
        fs.DocumentSnapshot snapShot = await firestore()
            .collection('environments')
            .doc(docuID)
            .collection('Washing')
            .doc('monday')
            .get();
        if (snapShot == null || !snapShot.exists) {
          print('does not exist');
        } else {
          await getData(docuID, 'Washing');
        }
      setState(() {});
    });
  }

   getData(docuID, machineName) async {
    return await firestore()
        .collection('environments')
        .doc(docuID)
        .collection(machineName)
        .doc('monday')
        .get()
        .then((val) {
      timeDetails.addAll(val.data());
    }).whenComplete(() {
      object.add('Mo-$machineName-${timeDetails['timeslots'].values}');
      print(object);
      setState(() {});
    });
  }

This also happens in debugPrint. Would anyone know why this is happening and how I could solve it? Any help on this would be appreciated!