Looks like there a problems with the WLAN using the USB-C to headphone adapter (see iPad Pro reports). If this happens with the iPhone I am really in trouble because I am using my wired headphones much more with my iPhone than with the iPad....
Yes, looks like there are some issues that multiple people have already encountered. Hope this can be resolved rather quickly via firmware.
Btw Alex, are you from a German speaking background by chance? I’m asking because I haven’t found another area that uses the term WLAN so often and the rest of the English speaking world seems to use the term Wi-Fi for the same thing.