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Single Item last field gets duplicated on Replace (When upsert: true and field names in Datastore are in camel case)

See original GitHub issue

Bug:

When replacing a field value on single item mode, the last field that gets updated duplicates itself in the DataStore file.

Replication:

public static class Program
{
    public static void Main(string[] args)
    {
        var entity = new Entity();
        
        for (int i = 1; i <= 2; i++)
        {
            // First to Update
            entity.DoesNotDuplicate = $"Updated {i} Times, Doesn't Duplicate";
                    
            // Last to Update
            entity.Duplicates = $"Updated {i} Times, Duplicates";
            Thread.Sleep(500);
        }
    }
    internal class Entity
    {
        private static readonly DataStore _dataStore = new DataStore("DuplicateBug.json");

        internal string? DoesNotDuplicate
        {
            get => _dataStore.GetItem(nameof(DoesNotDuplicate));
            set => _dataStore.ReplaceItem(nameof(DoesNotDuplicate), value, true);
        }

        internal string? Duplicates
        {
            get => _dataStore.GetItem(nameof(Duplicates));
            set => _dataStore.ReplaceItem(nameof(Duplicates), value, true);
        }
    }
}

Output:

{
  "doesNotDuplicate": "Updated 2 Times, Doesn't Duplicate",
  "duplicates": "Updated 1 Times, Duplicates",
  "duplicates": "Updated 2 Times, Duplicates"
}

Observation:

the doesNotDuplicate field is updated correctly, does not duplicate itself since it is the first field updated.
the duplicates field is not updated correctly, and duplicates itself instead.