I looked a bit closer into my issue. I made sure I added the capabilities to the config as per previous replies, but that by itself wasn’t working.
Checking an older version of the server, the previous file watching (1.62.0) was working fine for me, but after the move to using neovim for file watching, it seems that neovim wasn’t sending any changes to the watched files for some reason.
I looked at the LSP info and I saw a recommendation to install inotify-tools for better performance on watching folders. For some reason, installing that package and seeing the file watch backend change to inotify, it seems to have fixed the file watching and I can see the language server receiving notifications about those changes now. For which I also see the errors properly updating. No idea why the previous backend wasn’t working for me.
Perhaps this info will help you.