Lambda task timeout but no application log - amazon-web-services

Question

I have a python lambda that triggers by S3 uploads to a specific folder. The lambda function is to process the uploaded file and outputs it to another folder on the same S3 bucket.
The issue is that when I do a bulk upload using AWS console, some files do not get processed. I ended up setting a dead letter queue to catch these invocations. While inspecting the message in the queue, there is a request ID which I tried to find it in the lambda logs.
These are the logs for the request ID:
Now the odd part is that in the python code, the first line after the imports is print('Loading function') which does not show up in the lambda log?
Added the python code here. It should still print the Processing file name: " + key which is inside the handler ya?
import urllib.parse
from datetime import datetime
import boto3
from constants import CONTENT_TYPE, XML_EXTENSION, VALIDATING
from xml_process import *
from s3Integration import download_file
print('Loading function')
s3 = boto3.client('s3')
def lambda_handler(event, context):
# Get the object from the event and show its content type
bucket = event['Records'][0]['s3']['bucket']['name']
key = urllib.parse.unquote_plus(event['Records'][0]['s3']['object']['key'], encoding='utf-8')
print("Processing file name: " + key)
try:
response = s3.get_object(Bucket=bucket, Key=key)
xml_content = response["Body"].read()
content_type = response["ContentType"]
tree = ET.fromstring(xml_content)
key_file_name = key.split("/")[1]
# Creating a temporary copy by downloading file to get the namespaces
temp_file_name = "/tmp/" + key_file_name
download_file(key, temp_file_name)
namespaces = {node[0]: node[1] for _, node in ET.iterparse(temp_file_name, events=['start-ns'])}
for name, value in namespaces.items():
ET.register_namespace(name, value)
# Preparing path for file processing
processed_file = key_file_name.split(".")[0] + "_processed." + key_file_name.split(".")[1]
print(processed_file, "processed")
db_record = XMLMapping(file_path=key,
processed_file_path=processed_file,
uploaded_by="lambda",
status=VALIDATING, uploaded_date=datetime.now(), is_active=True)
session.add(db_record)
session.commit()
if key_file_name.split(".")[1] == XML_EXTENSION:
if content_type in CONTENT_TYPE:
xml_parse(tree, db_record, processed_file, True)
else:
print("Content Type is not valid. Provided value: ", content_type)
else:
print("File extension is not valid. Provided extension: ", key_file_name.split(".")[1])
return "success"
except Exception as e:
print(e)
raise e
I don't think its a permission issue as other files uploaded in the same batch were processed successfully.