Opening a newly created .puz file in Across Lite causes a crash

[Q726kbXuN]

The following simple code to create a .puz file creates a file that causes recent versions of Across Lite to crash.

const puz = require("./dist")
const fs = require('fs');

const puzzle = {
    "width": 2,
    "height": 2,
    "solution": "ABCD",
    "clues": [
        "Clue: AB",
        "Clue: AC",
        "Clue: BD",
        "Clue: CD",
    ]
}

const data = puz.printBinaryFile(puzzle);

fs.writeFileSync('example-output.puz', data);

Attempting to open example-output.puz will result in a crash on Across Lite v2.5 on both the Mac and Windows.

This is because the puzzle format flag (called "unknown3" in code) is being set to "0x0000". Across lite requires 0x0001 for normal crossword puzzles.