Why is the AWS SSM SDK caching results of DescribeParametersCommand and how to avoid this - amazon-web-services

Question

I am currently having some strange behaviour with the #aws-sdk/client-ssm AWS Node.JS SDK. The following code is incorrectly printing length:0
import {SSMClient, PutParameterCommand, ParameterType, DescribeParametersCommand, DeleteParametersCommand } from "#aws-sdk/client-ssm";
const client = new SSMClient({});
const name = 'param-name';
// clean up to allow multiple runs
await client.send(new DeleteParametersCommand({ Names: [name] }));
// make first 'list' call
const res1 = await client.send(new DescribeParametersCommand({}));
const list1 = (res1.Parameters || []).filter(p => p.Name === name);
// add parameter
(await client.send(new PutParameterCommand({ Name: name, Value: 'value', Type: ParameterType.STRING })))
// expect second 'list' to show this newly added parameter
const res2 = await client.send(new DescribeParametersCommand({}));
const list2 = (res2.Parameters || []).filter(p => p.Name === name);
// length=0. However, if we comment out first `client.send(new DescribeParametersCommand({}))` above then length=1
console.log('length:', list2.length);
However, if I comment out the first call to client.send(new DescribeParametersCommand({})) then the correct value is logged: length: 1:
...
// make first 'list' call
// const res1 = await client.send(new DescribeParametersCommand({}));
// const list1 = (res1.Parameters || []).filter(p => p.Name === name);
...
const res2 = await client.send(new DescribeParametersCommand({}));
const list2 = (res2.Parameters || []).filter(p => p.Name === name);
// length=0. However, if we comment out first `client.send(new DescribeParametersCommand({}))` above then length=1
console.log('length:', list2.length);
It appears that the result to DescribeParametersCommand is being cached? However, there is nothing about caching in the documentation or anything about invalidating the cache.