Unlabeled AI item in tab context menu in 147

There's an unlabeled submenu when right clicking on tabs.

I've found it in today's nightly on Linux.

It seems to be an AI item:

Uncaught Error: Failed to load resource:///modules/GenAI.sys.mjs
    updateContextMenu chrome://browser/content/tabbrowser/tabbrowser.js:9816
    <anonymous> chrome://browser/content/main-popupset.js:555
tabbrowser.js:9816:5
    updateContextMenu chrome://browser/content/tabbrowser/tabbrowser.js:9816
    <anonymous> chrome://browser/content/main-popupset.js:555

In particular, the code is:

    // Build Ask Chat items
    TabContextMenu.GenAI.buildTabMenu(
      document.getElementById("context_askChat"),
      this
    );