Steps to reproduce the issue

While processing a request (e.g. on a controller), if after some change on the framework (e.g. change language programatically) you need to refresh plugins language you can call "onAfterInitiliaze" event.

This will trigger languagefilter plugin also to ack the new language.

Expected result

languagefilter works with new language.

Actual result

languagefilter indeed works with new language but has "doubled" rules attached to the router.

This results in having 2 time "/en" language tag on sef urls.

System information (as much as possible)

Setting Value
PHP Built On Linux c19785.sgvps.net 6.6.21-MCIclouder470 #470 SMP PREEMPT_DYNAMIC Fri Mar 8 08:09:36 EET 2024 x86_64
Database Type mysql
Database Version 8.0.36-28
Database Collation utf8mb4_general_ci
Database Connection Collation utf8mb4_0900_ai_ci
Database Connection Encryption None
Database Server Supports Connection Encryption Yes
PHP Version 8.2.23
Web Server Apache
WebServer to PHP Interface cgi-fcgi
Joomla! Version Joomla! 4.4.8 Stable [ Pamoja ] 27-August-2024 16:00 GMT
User Agent Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Additional comments

Related function:
public function attachBuildRule(callable $callback, $stage = self::PROCESS_DURING)
{
if (!\array_key_exists('build' . $stage, $this->rules)) {
throw new \InvalidArgumentException(sprintf('The %s stage is not registered. (%s)', $stage, METHOD));
}

    $this->rules['build' . $stage][] = $callback;
}

Suggesting to "check if rule exists already, remove it and then re-apply it"