I tried playing around with compiling my own kernel. Everything is fine so far, except for that one thing.
Whenever I leave a wifi network or unplug my ethernet cable the system does not recognize, that the connection was lost and I have to manually tell the network manager.
I think it has to do with the new kernel, since that is the only thing that changed.
Since I feel like the documentation on the kernel components is pretty hard to parse, I'll ask it:
What kernel module/symbol did I set wrongly to provoke this behaviour?