webpacker: `resolved_paths` seems not working for images

I’m trying Webpacker 4 & Rails 6 (both on master branch)

I set resolved_paths: ['app/assets'] in webpacker.yml and put an image app/assets/images/avatar.png

In app/javascript/packs/application.js I adding import "images/avatar.png"

in Rails view <%= image_pack_tag 'images/avatar.png', alt: 'My avatar' %>

Then I start Rails and browse the page, I got Webpacker::Manifest::MissingEntryError in Home#index

Webpacker can't find images/avatar.png in /home/jasl/Workspaces/Ruby/my_app/public/packs/manifest.json. Possible causes:
1. You want to set webpacker.yml value of compile to true for your environment
   unless you are using the `webpack -w` or the webpack-dev-server.
2. webpack has not yet re-run to reflect updates.
3. You have misconfigured Webpacker's config/webpacker.yml file.
4. Your webpack configuration is not creating a manifest.
Your manifest contains:
{
  "_/assets/images/avatar.png": "/packs/_/assets/images/avatar-057862c747f0fdbeae506bdd0516cad1.png",
  "application.js": "/packs/application-f14777d02f7b6cadd4f6.js",
  "application.js.map": "/packs/application-f14777d02f7b6cadd4f6.js.map",
  "entrypoints": {
    "application": {
      "js": [
        "/packs/application-f14777d02f7b6cadd4f6.js"
      ],
      "js.map": [
        "/packs/application-f14777d02f7b6cadd4f6.js.map"
      ]
    }
  }
}

I think "_/assets/images/avatar.png": "/packs/_/assets/images/avatar-057862c747f0fdbeae506bdd0516cad1.png" look strange.

If I move app/assets/images/avatar.png to app/javascript/images/avatar.png, it would be OK.

But I do another experiment that I have app/assets/stylesheets/application.scss

In app/javascript/packs/application.js I adding import 'stylesheets/application'

In Rails view <%= stylesheet_pack_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>

No problem here.