I experience the same issue. Has anyone managed to troubleshoot this?
Uncaught (in promise) SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data translations.bundle.js:1002
Symfony\Component\Debug\Exception\FatalErrorException: Compile Error: Symfony\Component\Debug\DebugClassLoader::loadClass(): Failed opening required '/var/www/html/vendor/composer/../beberlei/doctrineextensions/src/Query/Mysql/Regexp.php' (include_path='/var/www/html/vendor/pear/pear_exception:/var/www/html/vendor/pear/console_getopt:/var/www/html/vendor/pear/pear-core-minimal/src:/var/www/html/vendor/pear/archive_tar:.:/usr/local/lib/php')