Since 10/02/2019 it's needed to flash those files If you are coming from previous build's
If you're coming from Stock ROM, there is no need to flash Vendor2Factory, Just Flash Latest Official TWRP and you're good to go.
Steps with you're coming from a factory2vendor build:
2- Flash Vendor2Factory
3- Flash Official TWRP with factory support
4- Reboot to Recovery
5- flash ROM and reboot
Steps If you're coming from Stock ROM (ZUI):
Internal Storage (After flashing the PE Build)
2- Flash ROM and Reboot
Factory support Official TWRP (Latest One):
It's recomended a Clean Flash If coming from Previous PE Build with Vendor2Factory.