With formvox enabled, mimetypes are broken in my installation

[Ascendor]

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Steps to reproduce

1. Activate formvox
2. Upload an image file
3. Find the image file in the files view
4. Notice, that it does not have a thumbnail
5. Click on the image and see that it doesn't load in browser, but downloads instead

Expected behaviour

The files should be rendered in browser and should receive a thumbnail. That happens, when the mime type is recognized correctly.

Actual behaviour

The image doesn't load in browser, but downloads instead

Server configuration

Web server: Apache/Nginx
Apache 2.4.66

Database: MySQL/Maria/SQLite/PostgreSQL
MariaDB
PHP version: 8.2/8.3/8.4
8.3

Nextcloud version: (see Nextcloud admin page)
32.0.6

List of activated apps

activity: 5.0.0
admin_audit: 1.22.0
app_api: 32.0.0
bruteforcesettings: 5.0.0
calendar: 6.2.1
circles: 32.0.0
cloud_federation_api: 1.16.0
comments: 1.22.0
contacts: 8.3.4
contactsinteraction: 1.13.1
dashboard: 7.12.0
dav: 1.34.2
deck: 1.16.3
federatedfilesharing: 1.22.0
federation: 1.22.0
files: 2.4.0
files_downloadlimit: 5.0.0-dev.0
files_external: 1.24.1
files_pdfviewer: 5.0.0
files_reminders: 1.5.0
files_sharing: 1.24.1
files_trashbin: 1.22.0
files_versions: 1.25.0
firstrunwizard: 5.0.0
forms: 5.2.4
formvox: 0.2.11
geoblocker: 0.5.19
gpoddersync: 3.16.0
logreader: 5.0.0
lookup_server_connector: 1.20.0
memories: 7.8.2
nextcloud_announcements: 4.0.0
nextpod: 0.7.10
notifications: 5.0.0
oauth2: 1.20.0
password_policy: 4.0.0
photos: 5.0.0
privacy: 4.0.0
profile: 1.1.0
provisioning_api: 1.22.0
recommendations: 5.0.0
related_resources: 3.0.0
richdocuments: 9.0.3
richdocumentscode: 25.4.902
serverinfo: 4.0.0
settings: 1.15.1
sharebymail: 1.22.0
spreed: 22.0.9
support: 4.0.0
survey_client: 4.0.0
systemtags: 1.22.0
tasks: 0.17.1
text: 6.0.1
theming: 2.7.0
twofactor_backupcodes: 1.21.0
twofactor_nextcloud_notification: 6.0.0
twofactor_totp: 14.0.0
updatenotification: 1.22.0
user_status: 1.12.0
viewer: 5.0.0
weather_status: 1.12.0
webhook_listeners: 1.3.0
workflowengine: 2.14.0

Nextcloud configuration

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            ***REMOVED***
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "32.0.6.1",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "forcessl": true,
        "mail_smtpmode": "smtp",
        "mail_smtpsecure": "",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauth": true,
        "mail_smtpauthtype": "PLAIN",
        "mail_smtpdebug": false,
        "mail_smtptimeout": 10,
        "mail_send_plaintext_only": false,
        "mail_smtpstreamoptions": [],
        "mail_sendmailmode": "smtp",
        "theme": "",
        "maintenance": false,
        "loglevel": 2,
        "loglevel_frontend": 2,
        "loglevel_dirty_database_queries": 0,
        "logfile": "\/var\/log\/nextcloud\/nextcloud.log",
        "logfile_audit": "\/var\/log\/nextcloud\/nextcloud-audit.log",
        "logfilemode": 416,
        "syslog_tag": "Nextcloud",
        "syslog_tag_audit": "Nextcloud",
        "log.backtrace": false,
        "logdateformat": "F d, Y H:i:s",
        "logtimezone": "Europe\/Berlin",
        "log_query": false,
        "db.log_request_id": false,
        "log_rotate_size": 104857600,
        "profiler": false,
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trashbin_retention_obligation": "auto",
        "versions_retention_obligation": "auto",
        "updatechecker": true,
        "appstore.experimental.enabled": true,
        "overwrite.cli.url": "https:\/\/donain\/nextcloud",
        "filelocking.enabled": true,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "memcache.locking": "\\OC\\Memcache\\APCu",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 6379
        },
        "web.baseUrl": "https:\/\/domain\/nextcloud\/index.php\/apps\/web",
        "web.rewriteLinks": true,
        "defaultapp": "files",
        "allow_user_to_change_mail_address": true,
        "allow_user_to_change_display_name": true,
        "updater.release.channel": "stable",
        "mysql.utf8mb4": true,
        "default_phone_region": "DE",
        "default_language": "de",
        "default_locale": "de_DE",
        "default_timezone": "Europe\/Berlin",
        "maintenance_window_start": 4,
        "forbidden_filename_basenames": [
            "con",
            "prn",
            "aux",
            "nul",
            "com0",
            "com1",
            "com2",
            "com3",
            "com4",
            "com5",
            "com6",
            "com7",
            "com8",
            "com9",
            "com\u00b9",
            "com\u00b2",
            "com\u00b3",
            "lpt0",
            "lpt1",
            "lpt2",
            "lpt3",
            "lpt4",
            "lpt5",
            "lpt6",
            "lpt7",
            "lpt8",
            "lpt9",
            "lpt\u00b9",
            "lpt\u00b2",
            "lpt\u00b3"
        ],
        "forbidden_filename_characters": [
            "<",
            ">",
            ":",
            "\"",
            "|",
            "?",
            "*",
            "\\",
            "\/"
        ],
        "forbidden_filename_extensions": [
            " ",
            ".",
            ".filepart",
            ".part"
        ],
        "knowledgebase.embedded": true,
        "remember_login_cookie_lifetime": 1296000,
        "session_lifetime": 86400,
        "session_relaxed_expiry": true,
        "session_keepalive": true,
        "auto_logout": false,
        "davstorage.request_timeout": 30,
        "carddav_sync_request_timeout": 30,
        "token_auth_enforced": false,
        "token_auth_activity_update": 60,
        "auth.bruteforce.protection.enabled": true,
        "auth.bruteforce.protection.force.database": false,
        "auth.bruteforce.protection.testing": false,
        "ratelimit.protection.enabled": true,
        "auth.webauthn.enabled": true,
        "auth.storeCryptedPassword": true,
        "hide_login_form": false,
        "overwritehost": "",
        "overwriteprotocol": "https",
        "overwritewebroot": "\/nextcloud",
        "overwritecondaddr": "",
        "htaccess.RewriteBase": "\/nextcloud",
        "proxy": "",
        "proxyuserpwd": "***REMOVED SENSITIVE VALUE***",
        "proxyexclude": [],
        "allow_local_remote_servers": true,
        "appcodechecker": true,
        "has_internet_connection": true,
        "connectivity_check_domains": [
            "www.nextcloud.com",
            "www.startpage.com",
            "www.eff.org",
            "www.edri.org"
        ],
        "check_for_working_wellknown_setup": true,
        "check_for_working_htaccess": true,
        "check_data_directory_permissions": true,
        "appstoreenabled": true,
        "app_install_overwrite": [
            "gpgmailer"
        ],
        "memories.db.triggers.fcu": true,
        "enabledPreviewProviders": [],
        "memories.exiftool": "\/var\/www\/nextcloud\/apps\/memories\/bin-ext\/exiftool-amd64-glibc",
        "memories.vod.path": "\/var\/www\/nextcloud\/apps\/memories\/bin-ext\/go-vod-amd64"
    }
}

Browser

Browser name: Firefox/Chrome/Safari/…
Tested Firefox, Brave and Edge

Browser version: 124/125/…
Firefox (current version)
Brave Android 1.87.192
Edge 145.0.3800.82
Operating system: Windows/Ubuntu/Mac/…

Browser log

Network: Loading https://domain/nextcloud/core/preview?fileId=97206&x=32&y=32&mimeFallback=true&v=6b4ef8&a=0 results in a 303 redirect to: /nextcloud/core/img/filetypes/file.svg for all files

Console:
Warnungen zu Content-Security-Policy 2
Content-Security-Policy: Ignorieren von "blob:" innerhalb script-src-elem: 'strict-dynamic' angegeben 97110
Content-Security-Policy: 'unsafe-eval' oder 'wasm-unsafe-eval' innerhalb "script-src-elem" wird ignoriert. 97110
[WARN] viewer: Some mimes were ignored because they are not enabled in the server previews config 
Object { app: "viewer", uid: "Alex", level: 2, ignoredMimes: (4) […] }
previewUtils-BWqM5-N0.chunk.mjs:14:366
OCA.Files.Settings initialized files-main.js:1:592352
OCA.Files.Sidebar initialized files-sidebar.js:1:27525
OCA.Sharing.ShareSearch initialized files_sharing-files_sharing_tab.js:1:794
Setting current user talk-files-sidebar.js:193:8269
OCA.Comments.View initialized comments-comments-app.js:1:20376
Initializing unified search plugin-filters from talk talk-search.js:1:178934
Notifications permissions granted NotificationsApp-hrGoV45R.chunk.mjs:2:326991
Polling interval updated to 30000 NotificationsApp-hrGoV45R.chunk.mjs:2:326422
Started background fetcher as session_keepalive is enabled NotificationsApp-hrGoV45R.chunk.mjs:2:323582
Got notification data, restoring default polling interval. NotificationsApp-hrGoV45R.chunk.mjs:2:325377

[Ascendor]

Wow, this was fast. Thanks @Rikdekker!