Yes, u're right and I apologize. Today I dirty flashed 9.4.12 from 9.3.14 and everything seems fine, until I entered twrp 3.3.0-0... password needed.
fastboot boot recovery.img (orangefox)
install orangefox and then as u wrote, no password needed.
just to be sure, i read somewhere in this thread, that this release is not to install like described in post 1, if you are coming from miui official global. Cause it's china based.