Default v0-user-next.config.mjs doesnt get applied

I want to add a custom next.config.ts to my project but v0 creates a next.config.mjs that doesn't apply my config. The files are created as follows:

1//v0-user-next.config.mjs2/** @type {import('next').NextConfig} */34const nextConfig = {56  assetPrefix: process.env.ASSET_PREFIX ?? undefined,78}91011export default nextConfig

And the following next.config.mjs

1//next.config.mjs2let userConfig = undefined3try {4  userConfig = await import('./v0-user-next.config')5} catch (e) {6  // ignore error7}89/** @type {import('next').NextConfig} */10const nextConfig = {11  eslint: {12    ignoreDuringBuilds: true,13  },14  typescript: {15    ignoreBuildErrors: true,16  },17  images: {18    unoptimized: true,19  },20  experimental: {21    webpackBuildWorker: true,22    parallelServerBuildTraces: true,23    parallelServerCompiles: true,24  },25}2627mergeConfig(nextConfig, userConfig)2829function mergeConfig(nextConfig, userConfig) {30  if (!userConfig) {31    return32  }3334  for (const key in userConfig) {35    if (36      typeof nextConfig[key] === 'object' &&37      !Array.isArray(nextConfig[key])38    ) {39      nextConfig[key] = {40        ...nextConfig[key],41        ...userConfig[key],42      }43    } else {44      nextConfig[key] = userConfig[key]45    }46  }47}4849export default nextConfig

The resulting nextconfig has the assetPrefix nested in the default path

1{2  eslint: {3    ignoreDuringBuilds: true,4  },5  typescript: {6    ignoreBuildErrors: true,7  },8  images: {9    unoptimized: true,10  },11  experimental: {12    webpackBuildWorker: true,13    parallelServerBuildTraces: true,14    parallelServerCompiles: true,15  },16  default: {17    assetPrefix: "/counter-static",18  },19}

therefore it doesn't work.

is this something that I am doing wrong or is this a bug in v0?

Btw if I change line 5 in the next.config.mjs it works as intended

1userConfig = (await import('./v0-user-next.config'))?.default