2,4 GHz wifi working good for me. Only 5 GHz I have problem. You have problem with both bands?
This problem is also on “untouched” image - does not depend PINN
For wifi may be help this [TESTING] Kodi v19 builds for Raspberry Pi 2/3/4 - #243 by fzinken
(Country with capital letter)
I will try prepare " untouched" image again and better.
Test repo? You mean that not working installation of Samba, TVH etc. from Store?