Composer autoload issues while installing other plugins

[dave-carpenter-ae]

I've installed the s3-uploads plugin by running composer require humanmade/s3-uploads in the root directory of my project. Everything is working as expected: my constants are defined in wp-config.php alongside require_once __DIR__ . '/vendor/autoload.php'; and wp s3-uploads verify runs successfully.

When uploading and installing other plugins that have composer dependencies, they do not install correctly when autoload.php is loaded in wp-config.php. If I comment out the line, install the plugin, and uncomment the line, everything works fine.

Is this a plugin-specific incompatibility or am I misunderstanding how to install s3-uploads?