A lot of empty folders are generated on local disk / public and not removed

[fkerber]

I have searched for this issue and found several that sounded similar, but all of them should have been fixed in the past, but despite having the newest version, I still see this issue and have no idea what I might be overlooking.

I'm using Media Library (with Pro) in version 11.10.1 (pro 6.1.0) and store all uploaded files in a separate local disk. Everything is apparently working fine. However, in my standard local disk (/storage/app/public) I find thousands of (mostly empty) folders named with a UUID such as a57898913f102140ad9cbee23d8bd5c9.
Apparently, for every upload, such a folder is created. Running artisan media-library:delete-old-temporary-uploads is not removing them. I cannot find corresponding entries in the media table in my database.

I'm not sure which setting might be helpful, so I quote a few here:

'disk_name' => env('MEDIA_DISK', 'public'),
'media_model' => Media::class,
'temporary_upload_model' => Spatie\MediaLibraryPro\Models\TemporaryUpload::class,
'generate_thumbnails_for_temporary_uploads' => true,
'file_namer' => Spatie\MediaLibrary\Support\FileNamer\DefaultFileNamer::class,
'path_generator' => Spatie\MediaLibrary\Support\PathGenerator\DefaultPathGenerator::class,
'moves_media_on_update' => false,
'temporary_directory_path' => null,

Please let me know if you need any further info.