I updated some containers after over a year. Need help

Hi, yesterday I updated Mealie and Immich. Something i haven't done that for like over a year... quite a jump in versions. You may ask why? Afterall, everything just worked and I didn't need to change anything. Let's just say, I wanted to test my luck and getting back into the thrill when everything breaks. But lets start at the beginning. I have a selfbuild server running TrueNas. Used the apps catalog to install portainer. In there run Traefik, Gitea and Komodo. I then have all the other apps as compose files in git. A trigger that calls Komodo to pull the latest changes on push and restart the Stacks. Those too are managed via Toml files in git. So far, so good. Now I wanted to update Mealie first. Had just finished adding a ton of new recipes before I realized I may should update. (Seems like you can now link recipes as ingredients for others. Wanted to use that ofc) So I looked at the changelog on github. Couldn't find anything that indicates breaking changes. So I just updated the Version in my compose file and pushed... then I waited... reloaded the Website... it looked the same but i had to login again. User was not authorized. Damn. I checked the Komodo logs. Everything seemed fine, beside a warning about a missing root user in the DB. So I went on a journey to find a solution. Research suggested its the healthcheck throwing the error. Okay. So just give it the Mealie user and password to do the check? Nope. DB wont start at all... So I did more research. Long story short, after like 2h I reverted the changed to see if it still starts. It did. And you know what? I tried a different browser, just for fun. And it worked. I could login without problems. Why? Because some caching problems in the browser. Not because of the update itself... It was just a me problem, expecting problem where none are. Then I tried updating Immich... a lot of versions behind. even a major version... i prepared for the worst. Looked through the version logs. increased the versi