In the last few days I've had a message pop up saying
WhatsApp can't connect using the current Wifi network. Allow this app to use mobile data
My wifi is working ok, I can use other apps with out any problems
I have submitted a feedback, with screenshot
I have been having this same issue for a couple of months now, but I believe it started before I joined the One UI Beta program. I have reported it before but no practical feedback yet
I have a theory I'm testing out... in wifi settings there is an advance setting to Randomise the MAC address of the device..
Tried changing it to keep the device address... I'll report backing it works!