Error code 4 when move file within remote panel

When I trying to move any file from /tmp to /home I got "general failure, error code 4". Though copying the same files works fine. I attached video demonstration and log.

FYI Log was collected separately from attached video, thus this log shows only events from connecting to server to appearing of the error.

As the error message suggests, most likely the cause is:

Moving a remote file to a different filesystem (HDD)

See also https://winscp.net/eng/docs/sftp_codes#code_4

Yeah, you are correct. My /tmp and /home mounted as different partitions:
But why WinSCP can't just perform mv /tmp/ca.cer /home/ in such situation? It is better than just fail.

You are using SFTP. OpenSSH SFTP server cannot move files across file systems. If you want WinSCP to use mv shell command, use SCP protocol. Or you can add a custom command to WinSCP, if you want to use mv shell command, while in an SFTP session.