output export ssg generation for dynamic even with generateStaticParams id value is comming as %5Bslug%5D so page is not generated in build

Link to the code that reproduces this issue

https://gitlab.com/veractdev/prahars-webiste.git

To Reproduce

nextjs.config

/** @type {import('next').NextConfig} */
const nextConfig = {

    output: 'export',
    trailingSlash: true,

    images: {
        unoptimized: true,
    },

}

module.exports = nextConfig

blog/[slug]/page.tsx

export async function generateStaticParams() {
    const blogs = (await getAllBlogs()).data;
    if (blogs && blogs.length > 0) {
        let final = blogs.map((blog: BlogI) => ({
            slug: blog.id
        }))

        return final;
    } else {
        return [];

    }

export default async function Page({ params }: any) {
    let { slug } = params
    console.log("id before", slug)
    let data = (await getBlog(slug)).data;
    let blog = data as BlogI ?? null;

    return (
        <div>
            <div className="desktopBlogInnerPage">
                <div className="innerpage_title">{blog?.title}</div>

                <div className="image-container img"><Image src={blog.thumbnail} alt="Description of the image" width={1000} height={667} /></div>
                <div className="innerpage_content_padding">
                    {blog.content}
                </div>
            </div>

            <div className="mobileBlogInnerPage">
                <div className="innerpage_title">{blog.title}</div>
                <div className="image-container_mobile">
                    <div className="image-container img_mobile"><Image src={blog.thumbnail} alt="Description of the image" width={1000} height={667} /></div>
                </div>
                {/* <div style={{display: "flex", justifyContent:"center", backgroundSize:'contain', paddingTop:"40px"}}><div className="background_img"></div></div> */}
                <div className="innerpage_content_padding">
                    {blog.content}
                </div>
            </div>
        </div>
    )

}

Current vs. Expected behavior

Current behavior in npm build files are not generated for id with value Expected behavior to build files and generate

Provide environment information

Operating System:
  Platform: windows
  Arch: x64
  Version: 12
Binaries:
  Node: 20.9.0
  npm: 9.4.0
  pnpm: N/A
Relevant packages:
  next: 13.5.4
  eslint-config-next: N/A
  react: 18.2.0
  react-dom: 18.2.0

Which area(s) are affected? (Select all that apply)

Not sure

Which stage(s) are affected? (Select all that apply)

next build (local)

Additional context

No response

We could not detect a valid reproduction link. Make sure to follow the bug report template carefully.

Why was this issue closed?

To be able to investigate, we need access to a reproduction to identify what triggered the issue. We need a link to a public GitHub repository (template for App Router, template for Pages Router), but you can also use these templates: CodeSandbox: App Router or CodeSandbox: Pages Router.

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My repository is private and cannot make it public

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I did not open this issue, but it is relevant to me, what can I do to help?

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I think my reproduction is good enough, why aren't you looking into it quickly?

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vercel / next.js