Hi all, just for the record.
I installed TWRP on the following way.
1. Download twrp.img from
https://xiaomi.eu/community/threads...-without-brick-redmi-6-pro.45816/#post-443264
2. Boot in bootloader - adb reboot bootloader
3. Boot in TWRP - fastboot boot twrp.img
3. In TWRP install twrp.img
After that reboot phone in system and install PE update.
I confirm that camera crashing every time after I choose video mode.
Will try few more cameras and will rollback to the previous PE version if they do not work.