Thanks for the info. Sounds like this is something that the Xiaomi developers missed and not devs on this forum.
Updated to the latest July 30 build of MIUI 12 EU build and it is still not working.
Is there anyway someone can post this bug on the actual Xiaomi closed beta bug...
There is an option in WiFi settings to enable intelligent network switching and also the setting in developer settings. Neither work.
The latest release will prompt to switch to a different network or keep. In the past you would ignore the prompt and it would use 4G mobile data.
First all, thanks for all of the hard work making these ROMs for everyone to enjoy.
The bug I have noticed on all of the MIUI 12 Mi 9 releases is that the OS doesn't swap back to mobile data when the WiFi has no internet.
There are two uses for this for me personally.