`occ upgrade` gives Symfony \ Component \ Console \ Exception \ RuntimeException

Nextcloud version 20.0.4:
Operating system and version FreeBSD 12.2-RELEASE-p2 #1 r368515M:
Apache or nginx version Apache 2.4:
PHP version 7.3:

When manually upgrading to Nextcloud 20.0.4 using occ …

$ php occ upgrade --verbose 3
Nextcloud or one of the apps require upgrade - only a limited number of commands are available
You may use your browser or the occ upgrade command to do the upgrade

In ArgvInput.php line 174:
                                                          
  [Symfony\Component\Console\Exception\RuntimeException]  
  Too many arguments, expected arguments "command".       
                                                          

Exception trace:
  at /home/public/nc/3rdparty/symfony/console/Input/ArgvInput.php:174
 Symfony\Component\Console\Input\ArgvInput->parseArgument() at /home/public/nc/3rdparty/symfony/console/Input/ArgvInput.php:85                                                                                              
 Symfony\Component\Console\Input\ArgvInput->parse() at /home/public/nc/3rdparty/symfony/console/Input/Input.php:55                                                                                                          
 Symfony\Component\Console\Input\Input->bind() at /home/public/nc/3rdparty/symfony/console/Command/Command.php:214
 Symfony\Component\Console\Command\Command->run() at /home/public/nc/3rdparty/symfony/console/Application.php:1000
 Symfony\Component\Console\Application->doRunCommand() at /home/public/nc/3rdparty/symfony/console/Application.php:271
 Symfony\Component\Console\Application->doRun() at /home/public/nc/3rdparty/symfony/console/Application.php:147
 Symfony\Component\Console\Application->run() at /home/public/nc/lib/private/Console/Application.php:215
 OC\Console\Application->run() at /home/public/nc/console.php:100
 require_once() at /home/public/nc/occ:11

upgrade

What could be causing this? How can I troubleshoot?

php occ upgrade worked as expected without the --verbose option. I didn’t try with other forms of this option.

Would’ve helped if syntax/usage errors were reported as such.