Regression: No more link previews (NC 29, Deck 1.13.1) (Was: Links to other Cards do not show Card preview anymore)

[MacLemon]

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Describe the bug
Since upgrading to Nextcloud 29, cards in Deck that contain links to other cards, don't show a card preview anymore.

To Reproduce
Steps to reproduce the behavior:

1. Go to Deck
2. any card
3. Copy the URL from the browser's address bar
4. navigate to any other card
5. past the URL to the first card in the description field of the second card

Expected behavior
A preview of the card should appear. Basically the same view of the card that is used in Deck itself to represent the cards.

Actual behavior
Only the link is shown, no more card preview in the description.

Screenshots
see above.

Notes
This is a regression over Nextcloud 28 and earlier behavior where linked cards on the same instance would always show a convenient card preview allowing for efficient check of tags and completion status.
Since Nextcloud 29, each link has to be clicked, loaded and checked manually, whereas before it was possible to quickly glance/scroll over to get the status of all linked cards. (This behavior was great for very efficient task dependency checks.)

Client details:

• OS: macOS, but irrelevant
• Browser Firefox 129.0, but irrelevant, happens in any browser
• Version 129.0 (irrelevant)
• Device: Desktop

Server details

Operating system:

Web server: nginx/1.27.0 (irrelevant to the issue)

Database: 10.8.8-MariaDB (irrelevant to the issue)

PHP version: 8.1.2-1ubuntu2.18 (irrelevant to the issue, happens with any other PHP 8.x version)

Nextcloud version: Nextcloud Hub 8 (29.0.4)

Where did you install Nextcloud from: Source

Signing status:

No errors have been found.

List of activated apps:

Enabled:
  - activity: 2.21.1
  - admin_audit: 1.19.0
  - analytics: 4.14.0
  - announcementcenter: 6.8.1
  - bookmarks: 14.2.4
  - bruteforcesettings: 2.9.0
  - calendar: 4.7.15
  - circles: 29.0.0-dev
  - cloud_federation_api: 1.12.0
  - collectives: 2.13.0
  - comments: 1.19.0
  - contacts: 6.0.0
  - contactsinteraction: 1.10.0
  - dashboard: 7.9.0
  - dav: 1.30.1
  - deck: 1.13.1
  - external: 5.4.0
  - federatedfilesharing: 1.19.0
  - federation: 1.19.0
  - files: 2.1.0
  - files_automatedtagging: 1.19.0
  - files_downloadlimit: 2.0.0
  - files_external: 1.21.0
  - files_pdfviewer: 2.10.0
  - files_reminders: 1.2.0
  - files_sharing: 1.21.0
  - files_trashbin: 1.19.0
  - files_versions: 1.22.0
  - firstrunwizard: 2.18.0
  - groupfolders: 17.0.1
  - impersonate: 1.16.0
  - logreader: 2.14.0
  - lookup_server_connector: 1.17.0
  - maps: 1.4.0
  - nextcloud_announcements: 1.18.0
  - notes: 4.10.1
  - notifications: 2.17.0
  - notify_push: 0.7.0
  - oauth2: 1.17.0
  - password_policy: 1.19.0
  - phonetrack: 0.8.1
  - photos: 2.5.0
  - polls: 7.2.0
  - privacy: 1.13.0
  - provisioning_api: 1.19.0
  - quota_warning: 1.19.0
  - recommendations: 2.1.0
  - related_resources: 1.4.0
  - richdocuments: 8.4.4
  - serverinfo: 1.19.0
  - settings: 1.12.0
  - sharebymail: 1.19.0
  - smb_test: 0.3.9
  - spreed: 19.0.7
  - support: 1.12.0
  - systemtags: 1.19.0
  - tasks: 0.16.0
  - terms_of_service: 2.5.0
  - text: 3.10.1
  - theming: 2.4.0
  - twofactor_backupcodes: 1.18.0
  - twofactor_totp: 11.0.0-dev
  - twofactor_webauthn: 1.4.0
  - updatenotification: 1.19.1
  - user_status: 1.9.0
  - viewer: 2.3.0
  - weather_status: 1.9.0
  - workflowengine: 2.11.0

Nextcloud configuration:

<?php
$CONFIG = array (
  'passwordsalt' => '<REDACTED salt>',
  'secret' => '<REDACTED secret>',
  'trusted_domains' =>
  array (
    0 => '<REDACTED FQDN>',
    1 => '<REDACTED hostname>',
    2 => '<REDACTED IP Address>',
  ),
  'datadirectory' => '/data',
  'dbtype' => 'mysql',
  'version' => '29.0.4.1',
  'overwrite.cli.url' => 'https://<REDACTED FQDN>',
  'overwritehost' => '<REDACTED FQDN>',
  'overwriteprotocol' => 'https',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'nextcloud',
  'dbpassword' => '<REDACTED db passwird>',
  'dbpersistent' => '',
  'installed' => true,
  'instanceid' => '<REDACTED instance ID>',
  'activity_expire_days' => 14,
  'allow_local_remote_servers' => true,
  'auth.bruteforce.protection.enabled' => true,
  'blacklisted_files' =>
  array (
    0 => '.htaccess',
    1 => 'Thumbs.db',
    2 => 'thumbs.db',
  ),
  'cron_log' => true,
  'enable_previews' => true,
  'enabledPreviewProviders' =>
  array (
    0 => 'OC\\Preview\\PNG',
    1 => 'OC\\Preview\\JPEG',
    2 => 'OC\\Preview\\GIF',
    3 => 'OC\\Preview\\BMP',
    4 => 'OC\\Preview\\XBitmap',
    5 => 'OC\\Preview\\Movie',
    6 => 'OC\\Preview\\PDF',
    7 => 'OC\\Preview\\MP3',
    8 => 'OC\\Preview\\TXT',
    9 => 'OC\\Preview\\MarkDown',
  ),
  'filesystem_check_changes' => 0,
  'filelocking.enabled' => 'true',
  'htaccess.RewriteBase' => '/',
  'integrity.check.disabled' => false,
  'knowledgebaseenabled' => false,
  'log_rotate_size' => '104857600',
  'logfile' => '/var/log/nextcloud/nextcloud.log',
  'loglevel' => 2,
  'logtimezone' => 'Europe/Vienna',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'overwriteprotocol' => 'https',
  'preview_max_x' => 1024,
  'preview_max_y' => 768,
  'preview_max_scale_factor' => 1,
  'profile.enabled' => false,
  'redis' =>
  array (
    'host' => '/var/run/redis/redis-server.sock',
    'port' => 0,
    'password' => '<REDACTED redis password>',
    'timeout' => 0.5,
    'dbindex' => 1,
  ),
  'quota_include_external_storage' => false,
  'share_folder' => '/<REDACTED foldername>',
  'twofactor_enforced' => 'false',
  'twofactor_enforced_groups' =>
  array (
  ),
  'twofactor_enforced_excluded_groups' =>
  array (
  ),
  'mail_smtpmode' => 'smtp',
  'mail_smtpsecure' => 'ssl',
  'mail_sendmailmode' => 'smtp',
  'mail_from_address' => '<REDACTED hostname>',
  'mail_domain' => '<REDACTED domain name>',
  'mail_smtpauthtype' => '<REDACTED AUTH type>',
  'mail_smtpauth' => 1,
  'mail_smtphost' => '<REDACTED MX FQDN>',
  'mail_smtpport' => '<REDACTED port>',
  'mail_smtpname' => '<REDACTED Email Address>',
  'mail_smtppassword' => '<REDACTED smtppassword>',
  'trusted_proxies' =>
  array (
    0 => '127.0.0.1',
    1 => '::1',
    2 => '<REDACTED Proxy IP Address>',
  ),
  'maintenance' => false,
  'trashbin_retention_obligation' => 'auto, 7',
  'versions_retention_obligation' => 'auto, 30',
  'maintenance_window_start' => 1,
  'simpleSignUpLink.shown' => false,
  'default_phone_region' => '<REDACTED region code>',
  'default_language' => '<REDACTED lang>',
  'default_locale' => '<REDACTED locale>',
  'default_timezone' => '<REDACTED TZ>',
  'skeletondirectory' => '',
  'preview_concurrency_new' => 2,
  'preview_concurrency_all' => 4,
);

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/...
No, only internal user accounts used.

Logs

Nextcloud log (data/nextcloud.log)

Doesn't log anything when opening the detail view of a card.#### Browser log

Insert your browser log here, this could for example include:

a) The javascript console log

Unknown pseudo-class or pseudo-element ‘-ms-clear’.  Ruleset ignored due to bad selector.

b) The network log

https://cloud.example.org/avatar/maclemon/64?v=2
Transferred: NS_BINDING_ABORTED

[MacLemon]

Issue is still present in

• Nextcloud 29.0.5
• Deck 1.13.1

Addition to the general issue:
This does not only affect Deck-Card-Previews, but all link previews. (Issue title adapted accordingly.)