Same here it seems to be related to this function in the code:
[Fri Oct 27 12:51:21.329942 2023] [proxy_fcgi:error] [pid 156755:tid 140174377875008] [client 172.71.94.248:0] AH01071: Got error ‘PHP message: PHP Fatal error: Uncaught Error: Call to undefined function wp_get_current_user() in /wp-includes/capabilities.php:877\nStack trace:\n#0 /wp-content/plugins/wpdeepl/wpdeepl.php(19): current_user_can()\n#1 /wp-settings.php(462): include_once(‘…’)\n#2 /wp-config.php(92): require_once(‘…’)\n#3 /wp-load.php(50): require_once(‘…’)\n#4 /wp-admin/admin.php(34): require_once(‘…’)\n#5 /wp-admin/plugin-install.php(16): require_once(‘…’)\n#6 {main}\n thrown in /wp-includes/capabilities.php on line 877′, referer: /wp-admin/
My mistake. Tried to harden the plugin security and went overboard. 2.3.6.8 is fixed