sync_down_on_open not working for me as expected.

[VinayKadalagi]

"type": "sftp",
"save_before_upload": true,
"upload_on_save": true,
"sync_down_on_open": true,
"sync_skip_deletes": false,
"sync_same_age": true,
"confirm_downloads": false,
"confirm_sync": true,
"confirm_overwrite_newer": false,
Above are my sftp-config.json settings.
sync_down_on_open is true but it is not working for me.
I changed the remote file and then opened the previously synced local file. I expected local file to get updated but i received "No Operations to perform" and the file is not downloaded and synced. Please let me know if this is really an issue.

PS: I am using sftp_flags with proxy command. I am accessing actual server via an intermediate server (jump host). Other features are working fine...