I also had some really funky stuff happen on one of my switches. Never fixed it, sold it and got a new one... But I would try to exhaust all options even ask the atmosphere and various other discords. Def try the recovery packs too
https://gbatemp.net/threads/switch-forever-stuck-on-5-1-need-experts-devs-to-fix.542658/
https://gbatemp.net/threads/switch-forever-stuck-on-5-1-need-experts-devs-to-fix.542658/