It doesn't work for me either. I have a F1 that is in bootloop and relies exclusively on TWRP to be able to recover my data. Hopefully
@REIGNZ3 can solve our problem, although I know there are few of us who are still having problems with decryption.
Have you guys somehow managed to decrypt without having to remove the password (I can't remove it, as I don't have access to the system, but I do remember the password?
In my case, TWRP recognizes that the password is correct and tries to decrypt (FBE), but after two seconds TWRP restarts again without decrypting and asks me again for the password (a PIN).