Why does my redirects() in NextJS not work?

what am I doing wrong? I'm building an accessible website with NextJS and want to redirect to fitting pages to the plain-language-counterpart. But since they are a different kind of language, their URLs are different, too.

My routes are built like this:

• Standard language = my-website.com/about
• Plain language = my-website.com/plain-language/about

And I have a switch where I can just change the /plain-language/ part

Now I have these routes:

• my-website.com/accessible-webdesign

• my-website.com/plain-language/for-disabled-persons

And if I click the switch on the first one, it will link me to my-website.com/plain-language/accessible-webdesign, which doesn't exist! So I used redirects() and also restarted my server to fix this, but it doesn't work. It doesn't redirect and I get a 404 just as before.

Can you check my code and tell me, what I should change to make it work?

Thank you!

This is my next.config.js:

    const withBundleAnalyzer = require('@next/bundle-analyzer')({        enabled: process.env.ANALYZE === 'true',    });    /** @type {import('next').NextConfig} */    const path = require('path');    const withPWA = require('next-pwa')({        dest: 'public',        disable: process.env.NODE_ENV === 'development',        sw: 'sw.js'    })    const nextConfig = {        async redirects(){            return[                {                    source: '/plain-language/accessible-webdesign',                    destination: '/plain-language/for-disabled-persons',                    permanent: 'true'                }            ]        },        reactStrictMode: true,        swcMinify: true,        trailingSlash: false,        webpackDevMiddleware: config => {            config.watchOptions = {                poll: 1000,                aggregateTimeout: 300            }        return config        },        sassOptions: {            includePaths: [path.join(__dirname, 'styles')]        },        experimental: {            images: {                layoutRaw: true            }        },        images: {            /*unoptimized: true - for static export!*/            /*deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],            formats: ['image/webp']*/        }    }    module.exports = withBundleAnalyzer(withPWA({nextConfig}));