Ok, just don't complain about my third party addons and repos. They are not gonna be removed until I decide to stop using the nightly.
I did mention my third party addons and repos on early June (message 36 as seen above), but I got no reaction about them back then. Since they are the main reason I decided to use kodi 20 alphas and thus the nightly, I am not going to remove them, but neither I will ask support for anything about them.
And so far, the weird behavior of kodi while installing some of those third party addons has provided me with more knowledge than I expected.
Besides that, for me, the addons from the main repo are more troublesome than the third party ones, e.g. youtube and twitch with their api keys, speedtest which does not yet have a python 3.9 compatible version on the main repo, simple iptv (that I forgot I had it installed) that caused the recent issue etc.
I keep the nightly x64 installation without any addons, excluding confluence, but I update it twice a month now because I can not stand that wifi inconsistency. There is also a dlna bug (since v18 at least) I want to file to kodi's github because it has not yet been fixed. Plus an already open bug for the subtitles' font (by me) that I want to check its progress.
Leaving all the above aside, I removed pvr.iptvsimple from the kodi.failed folder and when I stopped kodi, it instantly renamed that folder back to .kodi! Is that normal?
---edit
I forgot to mention that I have not connected it to a tv yet, because I am still looking for a way that will allow me to work with minimal annoyances over ssh.