1) I would suggest adding this note on the extension page or at least on the discussion page of the extension as it was hard to fing it unless using specific keywords (and some debug)
2) This might solve the issue, but cause an other error to appear on the console..
[xxxyyyzzz] /<wiki>/load.php?lang=en&modules=startup&only=scripts&raw=1&skin=vector ConfigException: GlobalVarConfig::get: undefined option: 'Overrides'
Backtrace:
from /var/www/mediawiki-1.39.6/includes/config/GlobalVarConfig.php(59)
# 0 /var/www/mediawiki-1.39.6/vendor/mwstake/mediawiki-component-manifestregistry/src/ManifestAttributeBasedRegistry.php(47): GlobalVarConfig->get()
# 1 /var/www/mediawiki-1.39.6/extensions/DrawioEditor/src/DrawioInspectorPluginModules.php(14): MWStake\MediaWiki\Component\ManifestRegistry\ManifestAttributeBasedRegistry->__construct()
# 2 /var/www/mediawiki-1.39.6/includes/ResourceLoader/FileModule.php(1265): MediaWiki\Extension\DrawioEditor\DrawioInspectorPluginModules::getPluginModules()
# 3 /var/www/mediawiki-1.39.6/includes/ResourceLoader/FileModule.php(608): MediaWiki\ResourceLoader\FileModule->expandPackageFiles()
...