Mi9T/K20 here
What do you mean by magisk 11?
I have magisk manager 8.0.2 and magisk 21.
In Last version 20.10.30 the root worked with twrp 3.4 and magisk 21 ...
It was a bit weird, flash Rom, magisk patched boot and then magisk 21 but it worked. Now no matter what, I get a boot to fastboot...