How to properly set and query siteMetadata in Gatsbyjs?

Question

The issue I am running into is that when I set a key-value pair in the gatsby-config.js file I am not able to see the data inside GraphiQL. I am following the documentation and using keys that are used in the example code. See here for the documentation: https://www.gatsbyjs.org/docs/gatsby-config/#sitemetadata

Here is my gatsby-config.js file:

module.exports = {
  siteMetadata: {
    title: `My Photography Site`,
    description: `Just the best`,
  },
  plugins: [
    `gatsby-plugin-emotion`,
    `gatsby-transformer-remark`,
    {
      resolve: `gatsby-source-filesystem`,
      options: {
        name: `src`,
        path: `${__dirname}/src/`,
      },
    },
    {
      resolve: `gatsby-plugin-typography`,
      options: {
        pathToConfigModule: `src/utils/typography`,
      },
    },
  ],
}

Here is my GraphiQL query (after restarting the development server to reload the gatsby-config.js file):

query SiteQuery {
  site {
    siteMetadata {
      title
      description
    }
  }
}

Expected results from the GraphiQL:

{
  "data": {
    "site": {
      "siteMetadata": {
        "title": "My Photography Site",
        "description": "Just the best"
      }
    }
  }
}

Here is the actual result of the GraphiQL:

{
  "errors": [
    {
      "message": "Cannot query field \"description\" on type \"SiteSiteMetadata\".",
      "locations": [
        {
          "line": 5,
          "column": 7
        }
      ],
      "stack": [
        "GraphQLError: Cannot query field \"description\" on type \"SiteSiteMetadata\".",
        "    at Object.Field (/mnt/c/Users/Spencer/dev/gatsbyjs/hello-world/node_modules/graphql/validation/rules/FieldsOnCorrectType.js:64:31)",
        "    at Object.enter (/mnt/c/Users/Spencer/dev/gatsbyjs/hello-world/node_modules/graphql/language/visitor.js:334:29)",
        "    at Object.enter (/mnt/c/Users/Spencer/dev/gatsbyjs/hello-world/node_modules/graphql/language/visitor.js:385:25)",
        "    at visit (/mnt/c/Users/Spencer/dev/gatsbyjs/hello-world/node_modules/graphql/language/visitor.js:252:26)",
        "    at validate (/mnt/c/Users/Spencer/dev/gatsbyjs/hello-world/node_modules/graphql/validation/validate.js:63:22)",
        "    at /mnt/c/Users/Spencer/dev/gatsbyjs/hello-world/node_modules/express-graphql/dist/index.js:154:52",
        "    at processTicksAndRejections (internal/process/task_queues.js:89:5)"
      ]
    }
  ]
}

What is odd is that I was able to successfully create a custom key-value pair before and it worked fine. I had a key of tagLine and a value of Panda Site. The normal title key worked as well.

Here are the software versions I am using:

• gatsby: 2.5.12
• node: v12.1.0
• npm: 6.9.0

I am running using Windows Subsystem for Linux (WSL). Let me know if you would like any other config files, including package.json.