I recently tried to update my xperia xa2 (pie, version 50.2.A.3.55, single sim).
Followed the instructions on https://doc.e.foundation/devices/pioneer/install and used:
[twrp-3.3.1-6-pioneer.img
e-0.9-o-2020051454222-dev-pioneer.zip
Did all go well, till the system shall reboot.
Gave be an infinity loop, till the sony logo. The loop ended that the system shut down with “this system is corrupt, shut down in 5sec”. I had to use Emma to install stock rom to bring it back to live.