qmlformat errors when JS array has trailing comma

When using Qt 6.3.0 built from the latest dev branch, qmlformat fails to format when a Javascript array has a trailing comma.

Repro.qml copied (from attachment) here:

import QtQuick

Item {
  Component.onCompleted: {
    let someList = [
      "item1",
      "item2",
    ];
  }
}

Running the attached minimally reproducible example:

qmlformat -i ./Repro.qml

This fails with a lot of output text and no clear explanation as to why (output log attached).

This level of output seems better reserved for a high verbosity level.