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WIFI 6e is "enhanced" not WIFI 6E 6GHz. Xiaomi China uses 2.4 & 5GHz. And as you can expect, a native Chinese rom will not support an illegal band. The Xiaomi BE7000 router uses two bands on 5GHz, so it gets 160 + 80MHz bands to boost speed. But despite being "WIFI 7" it does still not have...

I flash another kernel after installing MIUI on my SGS2. That fixes the problem until next ROM (Using NEAK kernel at present).

I have the same problem with MIUI + SGS2 for about a month or so. I had to flash another kernel to get it working normally. You can use MIUI and flash another kernel after MIUI is installed (must be done after every full install of MIUI until problem is solved).