Custom snippets are not working

[bpringe]

I gave this a shot, but I couldn't get custom snippets to work. I successfully toggled some other settings so I know my config file is getting picked up. The problem should be reproducible with just the example in the docs.

Originally posted by @maxrothman in https://github.com/BetterThanTomorrow/calva/issues/1108#issuecomment-1204755373