Firebase fetch inside for loop not working properly - flutter

Question

In my project, I took data from the android accessibility stream in a headless background function turned them into an array and split them into chunks for firebase limits, and used a for loop to iterate over them and check in firebase. Sometimes this is not working, especially since I can see the associability service runner but showing data from a bit ago. I think this happens when the user is offline and tried to fetch data from firebase. Can you please have a look at this code and tell me what the issue is and How I should solve it?
N.B: I changed some variable names for privacy purposes. There are no issues with them.
FlutterAccessibilityService.accessStream.listen((event) {
if (event.capturedText != null &&
event.capturedText != "" &&
isCold) {
text = event.capturedText!.toLowerCase();
List textList = getArray(text);
final sharedItems = getSimilarArray(fbtag, textList, sensitivity);
final sharedLocalItems =
getSimilarLocalArray(fbtag, textList, sensitivity);
final sharedAbsItems = getAbsLocalArray(fbtag, textList);
final sharedItemWithLastEval =
getSimilarArray(lastEvaluatedText, textList, sensitivity);
if (text != lastEventText &&
(sharedItemWithLastEval.length == 0 ||
lastEvaluatedText[0] == "first")) {
print("called related content");
print("bg currant text: " +
text.toString() +
" sensitivity: " +
sensitivity.toString() +
" minimumAbsMatch: " +
minimumAbsMatch.toString() +
" shared local items: " +
sharedLocalItems.toString() +
" shared abs items: " +
sharedAbsItems.toString() +
" shared items: " +
sharedItems.toString() +
" last : " +
lastEventText +
" last eval text: " +
lastEvaluatedText.toString() +
" Cold: " +
isCold.toString());
print("captured text: " + text.toString());
//GetRelatedContent(fbtag, event.capturedText);
print(sharedItems);
if (sharedLocalItems.length >= accuracy &&
sharedAbsItems.length >= minimumAbsMatch) {
print("main called");
List result = [];
lastEvaluatedText = sharedItems;
List chunkedList = chunking(sharedItems);
for (int i = 0; i < chunkedList.length; i++) {
FirebaseFirestore.instance
.collection('Content')
.where('keyWords', arrayContainsAny: chunkedList[i])
.get()
.then((value) {
for (int i = 0; i < value.docs.length; i++) {
result.add(value.docs[i].data());
print("sep");
print("result: " + result.toString());
}
if (i == chunkedList.length - 1) {
if (result.isNotEmpty) {
print("final result: " +
result[HighestMatchingIndex(sharedItems, result)[0]]
.toString());
print('result length called' +
' result: ' +
result.toString());
if (HighestMatchingIndex(sharedItems, result)[1] >=
accuracy) {
print('overlay called');
isCold = false;
Timer(Duration(seconds: 60), () {
print("Cold down");
isCold = true;
});
var FinalResult = result[
HighestMatchingIndex(sharedItems, result)[0]];
if (FinalResult['availableCountry']
.contains(country) &&
FinalResult['availableR']
.contains(r)) {
print("all passed");
String l = FinalResult[r]
[country] ??
FinalResult[r]['EN'];
String o =
FinalResult[r]['origin'];
ShowAlert(l, o, r);
}
}
}
}
});
}
}
//
}
lastEventText = text;
}
});