A lesser known limitation of S3 is that it does not have Read-After-Write consistency for overwriting PUTS & DELETE operations. Netflix has reported observing consistency taking hours for outliers. https://docs.aws.amazon.com/AmazonS3/latest/dev/Introduction...
Because its a distributed system and it takes time to propagate ?? I think its very well known, ppl just understand its normal and in 99.999% of cases does not matter.