Data connection not working when connected to wifi - Xiaomi Mi 8 Lite Questions & Answers

Hi all,
i've got this big problem and i dunno how to solve it.
Stock rom, MIUI 12.0.3, no root, developer options active.
I ran into this annoying bug months ago, while trying to get my car's android auto working with my phone without using usb cable.
I managed to connect my Mi 8 lite with the car via wifi connection; made it enabling Android Auto developer options (otherwise it wolud let me connect only with cable). Unfortunately once connected everything doesn't work, because there is no data: while wifi is on AND connected, my phone doesn't "want" to use my mobile data, even if i force data use by setting "mobile data always on" option in developer options.
I noticed this is not a problem of my car's infotainmnet, infact it happens also if i connect my phone to my wifi network unplugging phone's line cable (and so internet data ) from my router. Also in this case, with phone mobile data always active, my phone will stay connected to my wifi (which has no internet) and won't use my mobile data.
Does anyone have any idea/suggestion or know what i'm doing wrong?
Thx in advance for reading

This topic is discussed here: https://forum.xda-developers.com/t/...iui-while-aa-is-connected-wirelessly.4252187/
But no widely working workaround yet.

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