Well, it is working for me.
I have an unlocked bootloader as well with TWRP 188.8.131.52. I first installed a xiaomi.eu ROM (multi) with TWRP, then logged in. Then through TWRP installed Magisk 13.3. Logged in on the phone, installed the latest MagiskManager. Download the latest version of Universal SafetyNet Fix (V2, beta 5 test 7). Flash that through TWRP. Start the MagiskManager and choose which programs to hide (Google play services etc). In the settings of MagiskManager, disable Magisk Hide and then test whether it works or not.