I‘ve found a workaround:
1 - Turn on the hotspot (5 Ghz) on your computer.
2 - Connect your Xiaomi to this hotspot.
3 - Turn on the hotspot (5 Ghz) on your Xiaomi. This way, the channel for the hotspot is the same as the wifi currently in use.
4 - Turn off the hotspot on the computer.
5 - Now...