[Python] Read function for botocore.response.StreamingBody silently failing in lambda function

I am trying to the data of an object in S3 in my lambda function with the following code:

session = boto3.Session()
s3d = boto3.resource('s3')
s3_client = session.client('s3')
s3_resource = session.resource('s3')

def lambda_handler(event, context):
# Get the S3 bucket and object name from the event
bucket = event['Records'][0]['s3']['bucket']['name']
objectKey = urllib.parse.unquote_plus(event['Records'][0]['s3']['object']['key'], encoding='utf-8')
print(bucket)
print(objectKey)

content_object = s3_resource.Object(bucket, objectKey)
file_content = content_object.get()['Body'].read(None).decode('utf-8')
metadata = json.loads(file_content)


I know from logging debug messages that this is failing on the read() function. I've tried putting it in a try/except block and printing the error, but that isn't working. I'm able to get content_object.get()['Body'] by itself and confirm it is a botocore.response.StreamingBody object, and so the .read function should return all of the data according to the docs. Instead, the lambda is failing silently.

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