Google App Engine - 404 but only for .js files

I have a nuxt app deployed to GAE. My previous deploy happened about a month ago, the app was working as expected after that. I made some text changes recently, but after deploying saw that the app is not working as all the requests against .js files returned with 404.

My app.yml looks like the following:

runtime: nodejs14
instance_class: F2

handlers:
  - url: /_nuxt
    static_dir: .nuxt/dist/client
    secure: always

  - url: /(.*\.(gif|png|jpg|ico|txt))$
    static_files: static/
    upload: static/.*\.(gif|png|jpg|ico|txt)$
    secure: always

  - url: /.*
    script: auto
    secure: always

env_variables:
  HOST: '0.0.0.0'
  NODE_ENV: 'staging'

I've double checked in GAEs debugger that the .js files are there in the .nuxt/dist/client folder. I have an additional file there /.nuxt/dist/client/LICENSE, and GAE returns that without any problem when triggering a request <domain>/_nuxt/LICENSE. So it's just the .js files GAE doesn't want to serve...

Does anyone any suggestion?

Thanks in advance!

Update:
I cannot see any error other than the fact of the 404 response. Here're the logs and how dev-tools looks like.

If you're using custom server with your Nuxtjs, my solution is removing these two handlers in app.yaml.

For some reason my deployment failed today and got it fixed.

handlers:
  # - url: /_nuxt
  #   static_dir: .nuxt/dist/client
  #   secure: always

  # - url: /(.*\.(gif|png|jpg|ico|txt))$
  #   static_files: static/
  #   upload: static/.*\.(gif|png|jpg|ico|txt)$
  #   secure: always

  - url: /.*
    script: auto
    secure: always