Netlify dev: functions not accessible when starting in dev mode - next.js

Question

im trying to create a website using NextJS, prisma and netlify functions and deploy it to netlify.
The Website and nextJS framework work quite well while debugging using netlify dev.
The functions dont work. Trying to get a response from the functions ends in this error:
NestedError: Cannot read from `D:/Eigene Dateien/Github/beatraum/node_modules/.prisma`: EISDIR: illegal operation on a directory, read
at Module.createReadStream (file:///C:/Users/s.blaser/AppData/Roaming/npm/node_modules/netlify-cli/node_modules/cp-file/fs.js:21:9)
at processTicksAndRejections (node:internal/process/task_queues:96:5)
at copyFileAsync (file:///C:/Users/s.blaser/AppData/Roaming/npm/node_modules/netlify-cli/node_modules/cp-file/index.js:11:21)
at file:///C:/Users/s.blaser/AppData/Roaming/npm/node_modules/netlify-cli/node_modules/#netlify/zip-it-and-ship-it/node_modules/p-map/index.js:141:20
Caused By: Error: EISDIR: illegal operation on a directory, read {
nested: [Error: EISDIR: illegal operation on a directory, read] {
errno: -4068,
code: 'EISDIR',
syscall: 'read'
},
errno: -4068,
code: 'EISDIR',
syscall: 'read',
name: 'CopyFileError'
}
Node.js v18.12.1
It doesnt matter whether I start with netlify dev or netlify functions:serve - both ends in the same error.
I deployed the application and the functions work :o
So only the local environment seems to be broken.
I think it has something to do with the prisma dependency, but im quite unsure.
This is my netlify.toml:
# example netlify.toml
[build]
command = "npm run build"
functions = "netlify/functions"
publish = ".next"
[[plugins]]
package = "#netlify/plugin-nextjs"
## Uncomment to use this redirect for Single Page Applications like create-react-app.
## Not needed for static site generators.
#[[redirects]]
# from = "/*"
# to = "/index.html"
# status = 200
## (optional) Settings for Netlify Dev
## https://github.com/netlify/cli/blob/main/docs/netlify-dev.md#project-detection
[dev]
framework = "next"
command = "next dev -p 8080" # Command to start your dev server
targetPort = 8080 # Port that the dev server will be listening on
# publish = "dist" # Folder with the static content for _redirect file
## more info on configuring this file: https://docs.netlify.com/configure-builds/file-based-configuration/
This is my package.json:
{
"name": "beatraum",
"version": "0.1.0",
"private": true,
"scripts": {
"dev": "next dev",
"build": "next build",
"start": "next start",
"lint": "next lint",
"export": "next export",
"debug": "netlify dev --inspect"
},
"dependencies": {
"#hapi/iron": "^7.0.0",
"#netlify/functions": "^1.4.0",
"#next/font": "13.1.6",
"#prisma/client": "^4.9.0",
"#types/node": "18.11.18",
"#types/react": "18.0.27",
"#types/react-dom": "18.0.10",
"cookie": "^0.5.0",
"eslint": "8.33.0",
"eslint-config-next": "13.1.6",
"netlify-dev-plugin": "^1.0.28",
"next": "13.1.6",
"passport": "^0.6.0",
"passport-local": "^1.0.0",
"react": "18.2.0",
"react-dom": "18.2.0",
"react-netlify-forms": "^1.3.3",
"swr": "^2.0.3",
"typescript": "4.9.5",
"uuid": "^9.0.0"
},
"devDependencies": {
"autoprefixer": "^10.4.13",
"netlify-cli": "^12.10.0",
"postcss": "^8.4.21",
"prisma": "^4.9.0",
"tailwindcss": "^3.2.4"
}
}
I asked the same question in the netlify forum but didn't receive any answers.
https://answers.netlify.com/t/netlify-dev-functions-cannot-be-called-in-dev-mode-with-prisma-eisdir/85068
Thank you for your help in advance!