s3cmd does not sync down as expected with Digital Ocean Spaces

I have an issue whereby a few features of s3cmd do not work with DO Spaces, but work as expected with Amazon S3.

When I run the following command it downloads the entirety of the bucket as expected:

s3cmd sync -v --delete-removed "s3://bucket" "bucket"

When I run it a second time:

1. It downloads the entirety of the bucket again, where it should only download changed files.

2. It does not delete files in the destination that no longer exist on the source (–delete-removed).

I have ran the command with --debug and the only thing I can see is that DO Spaces always comes back with a file modified date/time of the current date/time.

I assume that s3cmd is using the md5 hash and the modified date/time to figure out if a file has changed since it’s last sync.

Any help would be appreciated.