Website on Plesk server and sudden 500 error

After Apache got updated on our Ubuntu distro, we suddenly started have Error 500 of Plesk shown on all our sites.

AH10292: Invalid proxy UDS filename (proxy:unix:///var/www/vhosts/system/|fcgi://

Then handling of UDS URIs to proxy connections from Apache to PHP-FPM seems to have been modified and that resulted with Error on Plesk.

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