Short version: When calling exists("/path/to/file") on an s3fs.S3FileSystem with wrong credentials, instead of throwing an error that the credentials are wrong, it instead responds with False. This is misleading, since the file might actually exist but the credentials are simply wrong.

Tested with version 2023.6.0, but existed in previous versions at least dating back to 2022 as well.

Was this a conscious decision or is this a bug? In case of the former, I heavily disagree with it...