[General Questions and Answers] I_did_it_just_tmrrow:
I was happy to find this thread here after a lot of searching for a solution for me.

My Xiaomi Mi9t was falling from a very high place :D Upsi

So back home I see that the display is not working at all. By pressing a little bit on the mainboard, I was able to get into my TWRP. Then I was able to decrypt the data partiton with:

twrp decrypt OPQRSM

I had a 6x6 pattern.

I pulled all data from /sdcard/ but when I want todo the same with /data/data the connection broke. Next day I attached a compatible display to the phone (display was from a friend who is not here anymore) and was able to boot my LOS20.

I disabled some data and the phone shutdown suddenly.

Then I reboot and tried it again. But it happens again. After that my system does not boot anymore...

So I detached the display again and boot-up twrp again. It was a bit difficult but now it works again. But the twrp decrypt comand failed all the time.

I read that this could be fixed by sideloading the zip-los20 again but I am totally unsure...

Am I in the same boat like @AOSP100 or can I rescure something.

SumUp: I am not able at the moment to unlock my data partition. Not with twrp decrypt command nor by touch/los-os.

Here is my twrp recovery fstab:

# Android fstab file.
# The filesystem that contains the filesystem checker binary (typically /system) cannot
# specify MF_CHECK, and must come before any filesystems that do specify MF_CHECK

# mount point fstype device device2 flags
/boot emmc /dev/block/bootdevice/by-name/boot
/dtbo emmc /dev/block/bootdevice/by-name/dtbo flags=backup=1;display="Dtbo";flashimg=1
/cache ext4 /dev/block/bootdevice/by-name/cache
/recovery emmc /dev/block/bootdevice/by-name/recovery flags=backup=1
/system_root ext4 /dev/block/bootdevice/by-name/system flags=display="System";backup=0
/vendor ext4 /dev/block/bootdevice/by-name/vendor flags=display="Vendor";backup=0;wipeingui

/system_image emmc /dev/block/bootdevice/by-name/system
/vendor_image emmc /dev/block/bootdevice/by-name/vendor

/data f2fs /dev/block/bootdevice/by-name/userdata flags=fileencryption=ice:aes-256-cts;wrappedkey
/firmware vfat /dev/block/bootdevice/by-name/modem flags=display="Firmware";mounttodecrypt
/cust ext4 /dev/block/bootdevice/by-name/cust flags=display="Cust"
/misc emmc /dev/block/bootdevice/by-name/misc
/modem emmc /dev/block/bootdevice/by-name/modem flags=backup=1;display="Modem"
/bluetooth emmc /dev/block/bootdevice/by-name/bluetooth flags=backup=1;subpartitionof=/modem
/dsp emmc /dev/block/bootdevice/by-name/dsp flags=backup=1;subpartitionof=/modem
/efs1 emmc /dev/block/bootdevice/by-name/modemst1 flags=backup=1;display=EFS
/efs2 emmc /dev/block/bootdevice/by-name/modemst2 flags=backup=1;subpartitionof=/efs1
/efsc emmc /dev/block/bootdevice/by-name/fsc flags=backup=1;subpartitionof=/efs1
/efsg emmc /dev/block/bootdevice/by-name/fsg flags=backup=1;subpartitionof=/efs1
/persist ext4 /dev/block/bootdevice/by-name/persist flags=display="Persist"
/persist_image emmc /dev/block/bootdevice/by-name/persist flags=display="Persist";flashimg=1

# Removable storage
/usb_otg vfat /dev/block/sdg1 /dev/block/sdg flags=fsflags=utf8;display="USB-OTG";storage;wipeingui;removable