AWS S3 rejecting deleteDirectory() request even though delete() works - laravel

Question

I'm on a Laravel 5.4 project, and in my composer.json file I'm using the following dependencies:
"league/flysystem-aws-s3-v3": "~1.0",
"aws/aws-sdk-php-laravel": "3.*",
When I try running the below, everything works fine:
Storage::disk('s3')->delete('exports/a_few_subdirectories/file.xls');
However, when I try running this line of code in an Artisan command, I get the below error:
Storage::disk('s3')->deleteDirectory('exports');
Here is the error message I receive:
Aws\S3\Exception\S3Exception Error executing "DeleteObjects" on "https://mybucket.s3.us-west-2.amazonaws.com/?delete"; AWS HTTP error: Client error: `POST https://mybucket.s3.us-west-2.amazonaws.com/?delete` resulted in a `400 Bad Request` response:
<?xml version="1.0" encoding="UTF-8"?>
<Error><Code>MalformedXML</Code><Message>The XML you provided was not well-formed (truncated...)
MalformedXML (client): The XML you provided was not well-formed or did not validate against our published schema - <?xml version="1.0" encoding="UTF-8"?>
After googling around, I found a couple of users who had this same error for significantly different reasons. One user said they had hit a 1,000 key limit, and another user said they were missing a required parameter in their post request, but these users were both using Ruby and not Laravel. Since I'm using these composer packages, I'm assuming the packages are working correctly, and it also seems like everything on S3 is set up correctly (permissions and security settings, for instance). Another fun fact is that I can successfully use deleteDirectory with the local driver instead of the S3 driver, so deleteDirectory is working in that instance.
Any ideas as to what might be amiss? I'd rather delete the directory than loop through files and delete them one by one on S3. Thanks in advance.