Bugzilla

**[Affected versions]:**
- Firefox Beta 126.0b2 - Build ID: 20240417091940
- Firefox Nightly 127.0a1 - Build ID: 20240418214121

**[Affected Platforms]:**
- Windows 11 x64
- macOS 14.1
- Ubuntu 22.04 x64

**[Prerequisites]:**
- Have the following prefs in the "about:config" page:
	- `browser.newtabpage.activity-stream.asrouter.devtoolsEnabled` set to `true`
	- `browser.newtabpage.activity-stream.newtabWallpapers.enabled` set to `true`
  
**[Steps to reproduce]:**
1. Open the browser using the profile from the prerequisites.
2. Navigate to "about:asrouter" and paste [sample JSON](https://gist.github.com/amychurchwell/e5d347d0d4dcb44745fa3a6c5616511c) into a text field.
3. Click the "Modify" button displayed near the text field from step 2.
4. Click any wallpaper card and dismiss the spotlight by clicking the "X" button.
5. Open a new tab page and observe the background.

**[Expected result]:**
- The wallpaper selected in step 4 was not applied to the New Tab page background.
    
**[Actual result]:**
- The wallpaper selected in step 4 was applied to the New Tab page background.

**[Additional Notes]:**
- This issue is reproducible if the spotlight is dismissed using the "Esc" key instead of clicking of the "X" button.
- Attached a screen recording of the issue.