Archiving Maximum Memory Incorrect

When archiving:

INFO [2020-12-30 22:00:01] 15  Downloading https://download.maxmind.com/app/geoip_download?edition_id=GeoLite2-City&suffix=tar.gz&license_key=<REDACTED> to /var/www/html/tmp/latest/GeoIP2-City.mmdb.tar.gz.download.
INFO [2020-12-30 22:00:05] 15  GeoIP2AutoUpdater: successfully downloaded 'https://download.maxmind.com/app/geoip_download?edition_id=GeoLite2-City&suffix=tar.gz&license_key=<REDACTED>'
ERROR [2020-12-30 22:00:06] 15  Fatal error encountered: /var/www/html/vendor/pear/archive_tar/Archive/Tar.php(1903): Allowed memory size of 134217728 bytes exhausted (tried to allocate 65011744 bytes)
 on /var/www/html/vendor/pear/archive_tar/Archive/Tar.php(1903)

Matomo encountered an error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 65011744 bytes) (which lead to: Error: array (
  'type' => 1,
  'message' => 'Allowed memory size of 134217728 bytes exhausted (tried to allocate 65011744 bytes)',
  'file' => '/var/www/html/vendor/pear/archive_tar/Archive/Tar.php',
  'line' => 1903,
  'backtrace' => ' on /var/www/html/vendor/pear/archive_tar/Archive/Tar.php(1903)
',
))

So it's limiting it to 128 MiB, but that doesn't make sense to me since in config/global.ini.php we have:

; Minimum advised memory limit in Mb in php.ini file (see memory_limit value)
; Set to "-1" to always use the configured memory_limit value in php.ini file.
minimum_memory_limit = 128

; Minimum memory limit in Mb enforced when archived via ./console core:archive
; Set to "-1" to always use the configured memory_limit value in php.ini file.
minimum_memory_limit_when_archiving = 768

I do not have anything related to memory in config/config.ini.php. So it should be limiting it to 768 MiB in this scenario, right?

My cron command:

/usr/bin/docker exec --user www-data matomo-01 /usr/local/bin/php /var/www/html/console core:archive --url=https://<REDACTED>

Start with config/global.ini.php and the console core:archive entry point, then compare the configured archive memory value with the 128 MiB limit shown in the Archive/Tar.php error. Reproduce using the supplied Docker cron command and verify that archiving applies the expected memory limit without exhausting it.