Steps to reproduce the issue

Install Joomla 4 on a server that requires the use of the FTP Layer (see #31857)

Go to Joomla Global Config and set Session Handler to be filesystem

Expected result

Sessions work as normal.

Actual result

The /var/www/html/sessions folder is created with 755 permissions. configuration.php is saved over FTP correctly.

FTP Log:

Thu Apr 22 16:35:26 2021 [pid 24478] [www-ftp] OK LOGIN: Client "::ffff:127.0.0.1"
Thu Apr 22 16:35:26 2021 [pid 24480] [www-ftp] OK MKDIR: Client "::ffff:127.0.0.1", "/var/www/html/sessions"
Thu Apr 22 16:35:26 2021 [pid 24480] [www-ftp] OK CHMOD: Client "::ffff:127.0.0.1", "/var/www/html/sessions 755"
Thu Apr 22 16:35:26 2021 [pid 24480] [www-ftp] OK UPLOAD: Client "::ffff:127.0.0.1", "/var/www/html/configuration.php", 3574 bytes, 10873.00Kbyte/sec

No files are seen in that folder

next page load gives error message:

System information (as much as possible)

Additional comments

If I manually 777 the /var/www/html/sessions folder then the page can load.