Before sending data to firebase realtime database, it’s right, but after I make the request, the data returned is incorrect.

for year in data:
  for month in data[year]:
    requests.put(f'{firebase}{year}/{month}.json', json=data[year][month])

The data variable is structured in this format

{
  "data": {
    "2024": {
      "9": {
        "1": []

Firebase response:

{
  "data": {
    "2023": {
      "9": [null, null, null, null, null, null, ...

where 2024 is the year, 9 is the month, and 1 is the day. When I print data[year][month] out before the request, it prints out the dictionary of days in the month which is correct. However, after making the request to firebase, it returns a list of days?? With the first couple of values being None. I cannot figure out why this is happening. Any help is appreciated!