just flashed successfully my Mi8SE, so far no problems.
- was using TWRP 3.2.3 1227 and MIUI 9.3.1
- downloaded this TWRP 3.3.0 0423
- it seems there are two different versions .... one is about 23MB, the other one about 60MB, I used the bigger one
- booted to TWRP 1227 and installed...