Long-running commands dies early and unexpectedly

[NiklasBr]

For example presta:sitemaps:dump keeps dying even though we have configured a long timeout:

www-data@610465edab50:~/pimcore$ bin/console debug:config ElementsProcessManagerBundle

Current configuration for "ElementsProcessManagerBundle"
========================================================

elements_process_manager:
    processTimeoutMinutes: 120
    archiveThresholdLogs: 7
    disableShortcutMenu: false
    reportingEmailAddresses: {  }
    additionalScriptExecutionUsers: {  }
    restApiUsers: {  }

Running this command directly on the server as the web user works:

www-data@610465edab50:~/pimcore$ bin/console presta:sitemaps:dump --section site_5 --base-url https://example.com/ public/var/tmp/sitemaps
Dumping sitemaps section site_5 into public/var/tmp/sitemaps directory
Created/Updated the following sitemap files:
    sitemap.site_5.xml
    sitemap.xml

What are we doing incorrectly here?