The slugify option in gatsby-plugin-page-creator does not work

[yacchi1123]

In File System Route API, there was a problem that slugs with underscores were converted to hyphens when trying to retrieve them.

For Exapmle.

- filepath
src/pages/hoge/{Hoge.slug}.tsx

- expected
/hoge/hoge_fuga

- actually
/hoge/hoge-fuga

The following document states that this event is caused by the use of slugify in gatsby-plugin-page-creator and can be avoided by using the slugify option.

https://www.gatsbyjs.com/plugins/gatsby-plugin-page-creator/#options

Then I modified gatsby-config.js based on the following document, but it did not work.

https://www.gatsbyjs.com/docs/reference/routing/file-system-route-api/#routing-and-linking

Here is the code I included in gatsby-config.js
There are no specific errors in the build.
Is there something wrong?

I use gatsby Version 4.24.3.
But I update Version to 5.3.3 had same results.

{
  resolve: `gatsby-plugin-page-creator`,
  options: {
    path: `${__dirname}/src/pages/hoge`,
    slugify: { preserveCharacters: ['_'] },
  },
},

I would appreciate it if you could tell me.