Steps to reproduce the issue

Create library for Joomla with files
geoip2.phar from https://github.com/maxmind/GeoIP2-php
"geoip.php":
include_once('geoip2.phar');

use
jimport('libraryname.geoip');

Expected result

No exceptions, all works as with Joomla 3.9.2

Actual result

Exception:
Failed opening required 'phar://geoip2.phar/vendor/autoload.php

System information (as much as possible)

Joomla 3.9.3
PHP 7.2

Additional comments

i think it is after this fix:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-7743