AWS ssm describe_parameters with ParameterFilter Option with Contains returns result but with Option BeginsWith does not return any data

Question

I am facing a strange issue on getting data from aws parameter-store. I am calling describe parameter to fetch the information about a parameter. Below is the Python Code for the same.

Parameter-Store : my-data.api_data

import boto3

ssm_client = boto3.client('ssm')

response = ssm_client.describe_parameters(
    ParameterFilters=[
        {
            'Key': 'Name',
            'Option': 'BeginsWith',
            'Values': ['my-data']
        }
    ]
)

response = [] The response returned is empty list. but if i change Option to Contains then i get the data.

import boto3

ssm_client = boto3.client('ssm')

response = ssm_client.describe_parameters(
    ParameterFilters=[
        {
            'Key': 'Name',
            'Option': 'Contains',
            'Values': ['my-data']
        }
    ]
)

retuns information related to my-data.api_data

I am unable to get what might be the issue. Please help.