Overriding asset_host results in incorrect asset paths

[optimuspwnius]

When the Rails app is configured with an asset_host the urls for the importmap look good until you override the asset_host in the controller. Eg:

config/environments/production.rb

config.asset_host = "https://cdn.example.com"

app/controllers/admin_controller.rb

class AdminController < ApplicationController
  self.asset_host = "https://cdn-admin.example.com"
end

The html output in the admin view has the wrong asset host. It has cdn.example.com instead of cdn-admin.example.com.

<script type="importmap" data-turbo-track="reload" nonce="">{
  "imports": {
    "application": "https://cdn.example.com/assets/application-11b28290a99e06bbb97f89de85099237219c655f.js",
    "admin": "https://cdn.example.com/assets/admin-c574738f5c1adffd9b7a877bf36ca6320be01a06.js",
    "@hotwired/turbo-rails": "https://cdn.example.com/assets/turbo-b993120d6c7ae1a4f86fc1faf67a6d7d462fa2f0.js",
    "@hotwired/stimulus": "https://cdn.example.com/assets/stimulus-33b5690d111cc0620be9dd1b12e236dacf03a024.js",
    "@hotwired/stimulus-loading": "https://cdn.example.com/assets/stimulus-loading-e6cc58d8195016dd774d85da7a37d34620facbfd.js",
    "controllers/hello_controller": "https://cdn.example.com/assets/controllers/hello_controller-8404a78da18e60f56632427531b2407db4f7f75e.js"
  }
}</script>
<link rel="modulepreload" href="https://cdn.example.com/assets/application-11b28290a99e06bbb97f89de85099237219c655f.js" nonce="">
<link rel="modulepreload" href="https://cdn.example.com/assets/admin-c574738f5c1adffd9b7a877bf36ca6320be01a06.js" nonce="">
<script src="https://cdn-admin.example.com/assets/es-module-shims.min-6e2591c8c15bae03d37b0f75efe46d7c609ef6e4.js" async="async" data-turbo-track="reload" nonce=""></script>

Love the work you guys are doing! ❤