Steps to reproduce the issue

This is specific configuration issue.
Setup your site as following example
HTTP Root: /var/www/site1/
Images: /var/images
create symlink /var/www/site1/images pointing to /var/images
Setup PHP open basedir restriction: /var/www/site1/:/var/images/

Open System info in Joomla Administration.

Expected result

See System info

Actual result

SplFileInfo::isDir(): open_basedir restriction in effect. File(/var/www/site1/images/..) is not within the allowed path(s): (/var/www/site1/:/var/images/:)

System information (as much as possible)

PHP 7.0.13, Linux system