Special:
You can use f2fs and ext4. Decide on your own whatever you want to use.
This TWRP is recommended for AospExtended
https://github.com/xiaomi-msm8998/device_xiaomi_sagit/releases/tag/3.2.3-4
You can use it with f2fs and ext4
Installation:
1: Dirty flash from AEX pie (stay on ext4)
* normal flash the zip as always :D
2: Clean flash ext4
*reboot to the TWRP and format data + wipe all
*reboot to recovery
*Flash ROM and GApps
*boot
3: Clean flash f2fs
*reboot...