@VfV
Dear I noticed the same thing. Did u receive an official answer from TPLink?
I've actually installed that firmware on my devices, while today I noticed that firmware is not more present on Tp-Link Support Section for TLWPA4220 (V.4), while another one is suggested that even has a prior date of publication.
Hope Tplink can explain the reson why of this strange behaviour, and above all which kind of action their users must make: if leaving the version 4.0.4 Build 20201023 Rel.31224 for those who installed it in January 2021 or replace that firmware version with the one currently shown on their site which is TL-WPA4220(EU)_V4_190326 2019-04-28.
If anyone from the community could give any clarification about this it would be very appreciated.