[Bug]: installing some mod_perl triggers locale error

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

On Debian 12 After installing OTRS2 or Request-Tracker (both depends on perl packages) Nextcloud (latest) stops working with error:

Error

Setting locale to en_US.UTF-8/fr_FR.UTF-8/es_ES.UTF-8/de_DE.UTF-8/ru_RU.UTF-8/pt_BR.UTF-8/it_IT.UTF-8/ja_JP.UTF-8/zh_CN.UTF-8 failed.

Please install one of these locales on your system and restart your web server.

While locales are OK.
Uninstalling packages with Perl dependencies makes NextCloud work again.

Steps to reproduce

1. Run NextCloud on Debian 12
2. Install request-tracker5 on same host
3. NextCloud gives Locale error and stops running services

Expected behavior

No impact for NextCloud instance whatewer other, unrelated packages are installed or removed

Nextcloud Server version

30

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.2

Web server

Apache (supported)

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

List of activated Apps

Enabled:
  - activity: 3.0.0
  - app_api: 4.0.5
  - bruteforcesettings: 3.0.0
  - calendar: 5.0.9
  - circles: 30.0.0
  - cloud_federation_api: 1.13.0
  - comments: 1.20.1
  - contacts: 6.1.3
  - contactsinteraction: 1.11.0
  - dashboard: 7.10.0
  - dav: 1.31.1
  - deck: 1.14.3
  - federatedfilesharing: 1.20.0
  - federation: 1.20.0
  - files: 2.2.0
  - files_downloadlimit: 3.0.0
  - files_pdfviewer: 3.0.0
  - files_reminders: 1.3.0
  - files_sharing: 1.22.0
  - files_trashbin: 1.20.1
  - files_versions: 1.23.0
  - firstrunwizard: 3.0.0
  - forms: 4.3.6
  - logreader: 3.0.0
  - lookup_server_connector: 1.18.0
  - mail: 4.1.2
  - nextcloud_announcements: 2.0.0
  - notifications: 3.0.0
  - oauth2: 1.18.1
  - password_policy: 2.0.0
  - photos: 3.0.2
  - privacy: 2.0.0
  - provisioning_api: 1.20.0
  - recommendations: 3.0.0
  - related_resources: 1.5.0
  - richdocuments: 8.5.3
  - richdocumentscode: 24.4.1103
  - serverinfo: 2.0.0
  - settings: 1.13.0
  - sharebymail: 1.20.0
  - spreed: 20.1.3
  - support: 2.0.0
  - survey_client: 2.0.0
  - suspicious_login: 8.0.0
  - systemtags: 1.20.0
  - tasks: 0.16.1
  - text: 4.1.0
  - theming: 2.5.0
  - twofactor_backupcodes: 1.19.0
  - updatenotification: 1.20.0
  - user_status: 1.10.0
  - viewer: 3.0.0
  - weather_status: 1.10.0
  - webhook_listeners: 1.1.0-dev
  - workflowengine: 2.12.0
Disabled:
  - admin_audit: 1.20.0
  - encryption: 2.18.0
  - files_external: 1.22.0
  - twofactor_nextcloud_notification: 4.0.0
  - twofactor_totp: 12.0.0-dev
  - user_ldap: 1.21.0

Nextcloud Signing status

Nextcloud Logs

Additional info

No response

The issue names no source file or test. First reproduce the failure on Debian 12 with request-tracker5 installed, then trace the locale initialization that produces the listed error. Done means Nextcloud continues working after the Perl-dependent package is installed, with a regression test covering the environment interaction.