I was thinking what happened to the P20 series that nothing was mentioned about EMUI 12 since the official list was released at the end of October but it seems that in
HOW TO UPDATE HUAWEI P20/P20 PRO TO EMUI 12 WITH HISUITE PROXY!!! - YouTube
Multi-Window on EMUI 12 / P20 Pro. Love the update. : r/Huawei
emui 12 for Huawei Nova 5t UK. : r/Huawei
Oldies Huawei P20 and Huawei P20 Pro received a beta version of EMUI 12 | gagadget.com
Huawei P20 Pro (EMUI 10) receiving February 2022 update, EMUI 12 confirmed - Huawei Central
Huawei P20 Pro CLT-L09 EMUI 12 EE/UK update Installation (C782) - Ministry Of Solutions | Huawei, Ee uk, Solutions
EMUI 12 beta rolling out for Huawei P20 and P20 Pro - Huawei Central