I encountered almost the same problem. I think maybe update my iphone7 to latest ios version will fix it. But after I update to ios 14.3. Problem not solved. The only way I managed to enable the networking is to connect my phone to xcode, open setting -> developer, then try several times to enable 'multipath networking' (as  tmoehle mentioned, every time i switch back to previous, the multipath shows disabled). Once I enabled the multipath networking, then everything back to normal. It is weird. Anyone can help?

hi, @iQQator, how to fix this. Now in my case, everytime I reboot the device, I could not connect to the network, I have to try to enable mutlipath networking via click settings -> developer->networking->multipath networking -> switch on;

Anyone could help? @Apple