Changes in Ember templates not reflected in Preview Browser automatically

🐛 bug report

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project
  adheres to.
• I have searched the issue tracker for an issue that matches the one I want
  to file, without success.

Description of the problem

Using the Ember template, changes to layout-related files (e.g. app/index.html, app/templates/application.hbs) are not automatically reflected in the Preview Browser.

In a Vanilla JS project, changes to layout files are immediately reflected in the Preview Browser.

How has this issue affected you? What are you trying to accomplish?

Previewing a change involves first saving the file, waiting for the Ember server to rebuild, and then clicking the refresh button in the Preview Browser. This inefficiency adds up over time and leads to decreased productivity.

To Reproduce

1. Create a sandbox using the Ember template and open the Console pane.
2. Once the app is running, make a change to app/templates/application.hbs.
3. Notice the app rebuilds in the Console pane, but the Preview Browser does not reflect the change until the file is saved and the Preview Browser manually refreshed.

Your Environment

Reproduce the issue with an Ember sandbox by editing app/templates/application.hbs and compare the behavior with the Vanilla JS template. Start by tracing the rebuild and Preview Browser update flow from the Console pane. Done means layout changes appear in the Preview Browser without a manual refresh after saving.