I don't know if this would help or not, but I've always run my servers using this docker image, and it just updates automatically:

https://hub.docker.com/r/lloesche/valheim-server

It also has many other features, such as automatic backups, mod installation, etc.

If you're familiar with docker at all, it's extremely easy to setup. You should be able to just mount your existing config directory into the docker container (after backing it up, just in case) to use your existing world.