You are a genius 
Your soft link worked. I wonder about this because I use the php-legacy-fpm package.
And Baikal it self should be also blocked. I don’t know much about AppArmor but I do know that things are generally blocked and have to be de-blocked actively to get it working. Never the less the solution is good enough, since I use Nginx only over my lokal WLAN no internet access.
Thanks a lot!