Nifi ListS3 list the same files again

[#1]

Hi, I'm using ListS3 1.20.0 to monitor S3 buckets for new files. It's configured to track timestamps. I noted that in a couple of days interval, the same files are fetched again and again. I checked LastModifiedTimestamp values but they did not changed, so processor should not have picked up them.

Could you please help here? I need to fetch only new files or only modified files. Thanks