Downloading file after update seems to cause fake data leakage between files

[PatrickNercessian]

Describe the bug
Downloading a file can result in data leakage with other files, where the downloaded file seems to have data from another file.

To Reproduce
Reproducing seems non-deterministic. It happens when I update 6 of the files I have in a given folder, and then soon after download one of the files.

Please complete the following information about the solution:

• Version: 1.5.12
• Region: us-east-1
• Was the solution modified from the version published on this repository? No
• If the answer to the previous question was yes, are the changes available on GitHub? N/A
• Have you checked your [service quotas] N/A (https://docs.aws.amazon.com/general/latest/gr/aws_service_limits.html) for the sevices this solution uses?
  [ ] Were there any errors in the CloudWatch Logs? No

Additional context
This was seen in the context of CSV files. Suddenly, the end of one file would have a bunch of data from another file. It took forever to realize this wasn't real, and was just an artifact of the download. If I refreshed the EFS UI page, and downloaded it again, it was the correct size and was missing the additional data.

[bryceaug]

Thanks for reporting the issue. We are investigating this.