[Bug] Safari: Case-insensitive search returns 0 results with emoji in document

[NghiaTranUIT]

Reproducible in vscode.dev or in VS Code Desktop?

• [x] Not reproducible in vscode.dev or VS Code Desktop

Reproducible in the monaco editor playground?

• [ ] Not reproducible in the monaco editor playground

Monaco Editor Playground Link

Can reproduce on Safari Web browser on the latest v0.54.0

https://microsoft.github.io/monaco-editor/playground.html?source=v0.54.0#XQAAAAIrAgAAAAAAAABBqQkHQ5NjdMjwa-jY7SIQ9S7DNlzs5W-mwj0fe1ZCDRFc9ws9XQE0SJE1jc2VKxhaLFIw9vEWSxW3yscw0m_1VlXnmFyGrY4OrtLzdbPAOcOj1cmr2b8Fg8va5YL5wHswkFrVJrfPtpxAHdkiJYXwpcP_qLelAdnaDKv6s8KNgd8HlYdEhVWasINXC5X-Xzw4kcMo1dreWpB61DlP9p4HyIPDQHVGYYwgrayPI_7CpdPeuiAWBYI5gQYvRmuMo8vVUSsOnJ4VytMQS-B9Uknt8yV4X7v2pu9l36FUi8PWOWnptY4k-U34W0I1h1NdRi6eO9TXqVaiHTbtKwx4qimckjV_gHmFfvks4v0tut3bw1Blr1iMxnDyNIMWNO8ngshBUiUFWEXxaVCLncuHIEvptXejaITW_00gHHrH7b4LTBREHZyTq07XVk_QU9KZXbaPhDs7if_wvOoX

Monaco Editor Playground Code

Use this JSON

{
  "report": {
    "metadata": {},
    "events": [
      {
        "urls": [
          "🤩💜",
          "var(--button-highlight-background-image, inherit)"
        ],
        "is_bitcode": false,
        "timestamp": 1754982320,
        "image_slot": 4,
        "sdk_version": "7.4.1.1",
        "image_file_size": 39430,
        "image_max_uniform_pixels": 64,
        "image_orientation": "landscape",
        "image_id": "80986E56-741C-4835-B6B6-6E219E5792B5"
      }
    ]
  }
}

Reproduction Steps

1. Open Monaco Editor Playground on the latest version v0.54.0 on Safari
2. Paste this JSON with Emoji into the Javascript Section

{
  "report": {
    "metadata": {},
    "events": [
      {
        "urls": [
          "🤩💜",
          "var(--button-highlight-background-image, inherit)"
        ],
        "is_bitcode": false,
        "timestamp": 1754982320,
        "image_slot": 4,
        "sdk_version": "7.4.1.1",
        "image_file_size": 39430,
        "image_max_uniform_pixels": 64,
        "image_orientation": "landscape",
        "image_id": "80986E56-741C-4835-B6B6-6E219E5792B5"
      }
    ]
  }
}

3. Try open the Search with Command+F and search for image_slot

Actual (Problematic) Behavior

The JSON has a string image_slot, but the search found no result if Match Case is OFF ❌

If the Match case is enabled -> Found 1 result ✅

Expected Behavior

• Should find 1 result of image_slot in the given JSON
• Work on Safari

Additional Context

This issue only occurs on Safari, both macOS 16 and macOS 26. Worked fine on Google Chrome

[stodirascu]

Confirming also having this issue!