Using mediawiki/vendor the installer fails to find `PropertySuggester\Hooks::onCreateSchema`, I guess because of an autoloading issue.
```
Creating tables for enabled extensions
[549c7b872c52e917bbc0572f] [no req] MWException from line 167 of /workspace/src/includes/Hooks.php: Invalid callback PropertySuggester\Hooks::onCreateSchema in hooks for LoadExtensionSchemaUpdates
Backtrace:
#0 /workspace/src/includes/Hooks.php(205): Hooks::callHook(string, array, array, NULL)
#1 /workspace/src/includes/installer/DatabaseUpdater.php(127): Hooks::run(string, array)
#2 /workspace/src/includes/installer/DatabaseUpdater.php(192): DatabaseUpdater->__construct(Wikimedia\Rdbms\DatabaseMysqli, boolean, NULL)
#3 /workspace/src/includes/installer/DatabaseInstaller.php(312): DatabaseUpdater::newForDB(Wikimedia\Rdbms\DatabaseMysqli)
#4 /workspace/src/includes/installer/Installer.php(1567): DatabaseInstaller->createExtensionTables(MysqlInstaller)
#5 /workspace/src/includes/installer/CliInstaller.php(138): Installer->performInstallation(array, array)
#6 /workspace/src/maintenance/install.php(125): CliInstaller->execute()
#7 /workspace/src/maintenance/doMaintenance.php(94): CommandLineInstaller->execute()
#8 /workspace/src/maintenance/install.php(175): require_once(string)
#9 {main}
```
extension.json has:
```
"AutoloadNamespaces": {
"PropertySuggester\\": "src/",
"PropertySuggester\\Maintenance\\": "maintenance/"
},
```
But maybe that is not available in the installer :( Which would be similar to T193855 / https://gerrit.wikimedia.org/r/#/c/431013/