UI in File Browser broken after upgrade from NC 12.0.4 to NC 13.0.0

Nextcloud version (eg, 12.0.2): 13.0.0
Operating system and version (eg, Ubuntu 17.04): Ubuntu 17.10
Apache or nginx version (eg, Apache 2.4.25): nginx 1.12.1
PHP version (eg, 7.1): 7.1 (via FPM)

The issue you are facing:

After upgrading the nextcloud installation from 12.0.4 to 13.0.0 the file browser UI broke

I’ve rechecked the hashes of relevant SCSS files but they seem to be in matching with a fresh download, I checked using sha256 on all of the apps files and a rsync dryrun on the entire apps folder, both of which do not report any potential problems

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. Install NC 12.0.4 with data directory in external location
  2. Upgrade manually to NC 13.0.0
  3. Open File Browser

The output of your Nextcloud log in Admin > Logging: No relevant output, only errors relate to the E2E and SSE applications, which is not related to this bug.

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'instanceid' => '[redacted]',
  'passwordsalt' => '[redacted]',
  'secret' => '[redacted]',
  'trusted_domains' => 
  array (
    0 => '[redacted]',
    1 => '[redacted]',
  ),
  'trusted_proxies' => 
  array (
    0 => '[redacted]',
  ),
  'datadirectory' => '/var/www/virtual/[redacted]/data',
  'overwrite.cli.url' => '[redacted]',
  'dbtype' => 'pgsql',
  'version' => '13.0.0.14',
  'dbname' => 'nextcloud',
  'dbhost' => '[redacted]',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'nextcloud',
  'dbpassword' => '[redacted]',
  'logtimezone' => 'Europe/Berlin',
  'installed' => true,
  'mail_smtpmode' => 'smtp',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_smtpauth' => 1,
  'mail_smtphost' => '[redacted]',
  'mail_from_address' => 'nextcloud',
  'mail_smtpname' => '[redacted]',
  'mail_smtppassword' => '[redacted]',
  'theme' => '',
  'filelocking.enabled' => true,
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' => 
  array (
    'host' => '[redacted]',
    'port' => '6379',
    'timeout' => 0.0,
    'dbindex' => 16,
    'password' => '[redacted]',
  ),
  'session_lifetime' => 2592000,
  'auth.bruteforce.protection.enabled' => false,
  'maintenance' => false,
  'loglevel' => 2,
  'mail_domain' => '[redacted]',
  'updater.secret' => '[redacted]',
);

The output of your Apache/nginx/system log in /var/log/____: No notable entries in Nginx or FPM logs.

I am having the exact same issue. No relevant logs sadly.