On `REL1_27`, when using `install.php --with-extensions` and BlueSpiceFoundation, the installer eventually fails:
```
...site_stats is populated...done.
A database query error has occurred.
Query: INSERT INTO `updatelog` (ul_key,ul_value) VALUES ( ..... )
Function: DatabaseUpdater::setAppliedUpdates
Error: 1062 Duplicate entry 'updatelist-1.27.4-15295832440' for key 'PRIMARY' (localhost:/tmp/quibble-mysql-cdias6r8/socket)
Backtrace:
#0 includes/db/Database.php(901): DatabaseBase->reportQueryError('Duplicate entry...', 1062, 'INSERT INTO `u...', 'DatabaseUpdater...', false)
#1 includes/db/Database.php(1467): DatabaseBase->query('INSERT INTO `u...', 'DatabaseUpdater...')
#2 includes/installer/DatabaseUpdater.php(481): DatabaseBase->insert('`updatelog`', Array, 'DatabaseUpdater...')
#3 includes/installer/DatabaseUpdater.php(427): DatabaseUpdater->setAppliedUpdates('1.27.4', Array)
#4 maintenance/update.php(199): DatabaseUpdater->doUpdates(Array)
#5 maintenance/doMaintenance.php(103): UpdateMediaWiki->execute()
#6 maintenance/update.php(244): require_once('/workspace/src/...')
#7 {main}
```
Dummy change: https://gerrit.wikimedia.org/r/c/mediawiki/extensions/BlueSpiceFoundation/+/441382 and comment `check experimental`.
That might be a race condition in the updater.