Symptoms
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Additional FTP accounts added in Plesk > Domains > example.com > FTP Access becomes the owner of the site's vhost:
# ls -ld /var/www/vhosts/plesktest.com/
drwx-x--. 5 ftpaccount psaserv 52 Oct 9 18:51 /var/www/vhosts/plesktest.com/ - The PHP running under an additional FTP user instead of the subscription's system user.
Cause
Such behaivior related to the fact that recently, a system user of a subscription was renamed in Domains > example.com > Web Hosting Access. It is expected behavior.
System user of a subscription and additional FTP user are created with the same UID. It can be seen with the following command while connected to the server via SSH:
# grep 'FTPuser|SYSuser' /etc/passwd
FTPuser:x:10013:1003::/var/www/vhosts/example.com:/bin/false
SYSuser:x:10013:1003::/var/www/vhosts/example.com:/bin/false
A username is requested by its UID. In case there are several usernames with the same UID, displayed username is the one which is placed higher in the file /etc/passwd. It can be checked with the command below:
# getent passwd 10013
FTPuser:x:10013:1003::/var/www/vhosts/example.com:/bin/false
Solution
To display the system user of the subscription as the owner of the subscription's files, rename the additional FTP user in Domains > example.com > FTP Access.
This will rewrite the file /etc/passwd and put the additional FTP user at the bottom of the file. After that, the name of the FTP user can be changed back.