[Bug]: OPcache buffer & interned strings buffers always full

⚠️ 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

I have two Nextcloud installations, on different dedicated servers managed by Virtualmin.
One installation is fresh and the other one has received upgrades.

On both installations, in the Administration Overview page, I get the following warning:

The PHP OPcache module is not properly configured. The OPcache buffer is nearly full. To assure that all scripts can be hold in cache, it is recommended to apply "opcache.memory_consumption" to your PHP configuration with a value higher than "512". The OPcache interned strings buffer is nearly full. To assure that repeating strings can be effectively cached, it is recommended to apply "opcache.interned_strings_buffer" to your PHP configuration with a value higher than "32"..

No matter what value I set the memory_consumption and interned_strings_buffer options to, even insanely high values, the warning will still show, still prompting me to raise the values to something even higher.

This started happening on Nextcloud versions >=28.

Steps to reproduce

1. Start with a Nextcloud installation version >= 28

Expected behavior

No warnings concerning OPcache buffers.

Installation method

Community Manual installation with Archive

Nextcloud Server version

master

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.3

Web server

Apache (supported)

Database engine version

MariaDB

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

Fresh Nextcloud Server install

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

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "cloud.aviettechnic.org"
        ],
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "28.0.3.2",
        "overwrite.cli.url": "https:\/\/cloud.aviettechnic.org",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauth": 1,
        "mail_sendmailmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "default_phone_region": "MT",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0
        },
        "defaultapp": "files",
        "maintenance": false,
        "loglevel": 3,
        "data-fingerprint": "c4fd14e1fb3af2acb9bd253d3cb2e2aa",
        "maintenance_window_start": 1
    }
}

List of activated Apps

Enabled:
  - activity: 2.20.0
  - admin_audit: 1.18.0
  - analytics: 4.12.0
  - announcementcenter: 6.8.0
  - appointments: 2.0.4
  - approval: 1.2.0
  - audioplayer: 3.4.1
  - calendar: 4.6.7
  - checksum: 1.2.3
  - circles: 28.0.0-dev
  - cloud_federation_api: 1.11.0
  - comments: 1.18.0
  - contactsinteraction: 1.9.0
  - dashboard: 7.8.0
  - dav: 1.29.1
  - deck: 1.12.2
  - external: 5.3.1
  - federatedfilesharing: 1.18.0
  - federation: 1.18.0
  - files: 2.0.0
  - files_accesscontrol: 1.18.0
  - files_antivirus: 5.4.2
  - files_automatedtagging: 1.18.0
  - files_bpm: 1.3.0
  - files_confidential: 2.1.0
  - files_pdfviewer: 2.9.0
  - files_reminders: 1.1.0
  - files_sharing: 1.20.0
  - files_trashbin: 1.18.0
  - files_versions: 1.21.0
  - firstrunwizard: 2.17.0
  - forms: 4.1.1
  - groupfolders: 16.0.4
  - impersonate: 1.15.0
  - integration_openai: 1.2.1
  - llm: 1.2.1
  - logreader: 2.13.0
  - lookup_server_connector: 1.16.0
  - nextcloud_announcements: 1.17.0
  - notes: 4.9.2
  - notifications: 2.16.0
  - notify_push: 0.6.10
  - oauth2: 1.16.3
  - password_policy: 1.18.0
  - photos: 2.4.0
  - privacy: 1.12.0
  - provisioning_api: 1.18.0
  - quota_warning: 1.18.0
  - recognize: 6.1.1
  - recommendations: 2.0.0
  - related_resources: 1.3.0
  - richdocuments: 8.3.2
  - richdocumentscode: 23.5.904
  - serverinfo: 1.18.0
  - settings: 1.10.1
  - sharebymail: 1.18.0
  - side_menu: 3.11.8
  - support: 1.11.0
  - suspicious_login: 6.0.0
  - systemtags: 1.18.0
  - tasks: 0.15.0
  - text: 3.9.1
  - theming: 2.3.0
  - translate: 2.1.0
  - twofactor_backupcodes: 1.17.0
  - updatenotification: 1.18.0
  - user_status: 1.8.1
  - viewer: 2.2.0
  - weather_status: 1.8.0
  - workflowengine: 2.10.0
Disabled:
  - bruteforcesettings: 2.8.0
  - encryption: 2.16.0
  - files_external: 1.20.0
  - survey_client: 1.16.0 (installed 1.16.0)
  - twofactor_totp: 10.0.0-beta.2
  - user_ldap: 1.19.0

Nextcloud Signing status

Technical information
=====================
The following list covers which files have failed the integrity check. Please read
the previous linked documentation to learn more about the errors and how to fix
them.

Results
=======
- core
	- INVALID_HASH
		- core/js/mimetypelist.js

Raw output
==========
Array
(
    [core] => Array
        (
            [INVALID_HASH] => Array
                (
                    [core/js/mimetypelist.js] => Array
                        (
                            [expected] => 550ab566d30693bfa24ec4b15d9df87731ae8a3be8f79dabf94757e5b8b20eec6e4b678f17af1718297f2872f6b04519eeb024d1dff11947f29da431c7f11201
                            [current] => 24e6faa4a1361e51ff70027024f41c4b37fdb5f6f347ceb095450ddbde2d0a6b6dd1403be92a912d2889064a9736a9bed89d7dc62470035fc1299d4b977c5f46
                        )

                )

        )

)

Nextcloud Logs

No response

Additional info

1. I mentioned above this affects two Nextcloud instances. The config report and app list concern the freshly installed one.
2. The invalid hash of file core/js/mimetypelist.js is another issue I am facing, and I've opened a separate issue.

PHP-FPM config:

[1706092746572748]
listen.mode = 0660
listen = /run/php/1706092746572748.sock
pm = dynamic
pm.max_children = 16
pm.start_servers = 2
pm.min_spare_servers = 1
pm.max_spare_servers = 8
php_value[upload_tmp_dir] = [REDACTED]
php_value[session.save_path] = [REDACTED]
php_value[log_errors] = On
php_admin_value[post_max_size] = 16G
php_admin_value[upload_max_filesize] = 16G
php_admin_value[max_execution_time] = 3600
php_admin_value[max_input_time] = 3600
php_admin_value[memory_limit] = 8G
php_admin_value[opcache.enable] = 1
php_admin_value[opcache.memory_consumption] = 512
php_admin_value[opcache.interned_strings_buffer] = 32
php_admin_value[opcache.max_accelerated_files] = 10000
php_admin_value[opcache.revalidate_freq] = 60
php_admin_value[opcache.validate_timestamps] = 0
php_admin_value[opcache.save_comments] = 1
php_admin_value[opcache.jit] = 1255
php_admin_value[opcache.jit_buffer_size] = 128M

Start at the Administration Overview page where the OPcache warning is displayed, then trace how the PHP OPcache values are read and compared with the configured values. Reproduce the warning with the supplied PHP-FPM settings and confirm that it disappears when the buffers are sufficiently sized; the issue does not name a source file or test.