Can't access to public bucket of another user

Amazon allows to list objects and access to public objects from bucket that does not belong to you -
aws s3 ls s3://ec2-downloads/
.....

Also it can be an error -
aws s3 ls s3://testim
A client error (AccessDenied) occurred when calling the ListObjects operation: Access Denied

But swift3 doesn't allow to list public bucket.

Reproduce steps:
1) set admin's acces_key/secret_key to .aws/config (Do not set a region!!! Because with region awscli will use s3v4 protocol which doesn't supported by swift3)

2) create bucket with public-read
aws --debug --endpoint-url http://127.0.0.1:8080/ s3api create-bucket --bucket testi --acl public-read

3) copy any file with public-read to the bucket
aws --debug --endpoint-url http://127.0.0.1:8080/ s3 cp tox.ini s3://testi/ttt --acl public-read

4) check it
aws --debug --endpoint-url http://127.0.0.1:8080/ s3 ls
aws --debug --endpoint-url http://127.0.0.1:8080/ s3 ls s3://testi
aws --debug --endpoint-url http://127.0.0.1:8080/ s3 cp s3://testi/ttt ttt

5) change access_key/secret_key to another user in .aws/config

6) try to list or copy object -
aws --debug --endpoint-url http://127.0.0.1:8080/ s3 ls s3://testi
> A client error (NoSuchBucket) occurred when calling the ListObjects operation: The specified bucket does not exist.
aws --debug --endpoint-url http://127.0.0.1:8080/ s3 cp s3://testi/ttt ttt
> A client error (404) occurred when calling the HeadObject operation: Key "ttt" does not exist