curl multi method does not honour proxybypass option

1. Go to Site administration > Reports > Security Checks > Checks all public / private paths (/report/security/index.php?detail=core_publicpaths)
   1. If the first 4 tests are not OK, rename your vendor/ and node_modules/ directories to something else
2. Once the first 4 tests are OK, edit your config.php, and set the following variables at the end of file, just before require_once({}DIR{} . '/lib/setup.php'); :

   $CFG->proxyhost = 'i.do.not.exist';

   $CFG->proxybypass = parse_url($CFG->wwwroot, PHP_URL_HOST);

3. Reload the page /report/security/index.php?detail=core_publicpaths

Current result :
The first test on vendor/ is red.

Expected result :
The first test on vendor/ should be green.