Writing and then Reading donesn't work in 1.12

[x] The readme doesn't contain a resolution to my issue
[x] The example doesn't contain a resolution to my issue

Versions

node: v16.9.1
prismarine-schematic: 1.2.1

Detailed description of a problem

If I try to use const schem2 = Schematic.read(await schem1.write()) the schem2 is not the same than schem1.

Your current code

const mineflayer = require("mineflayer");
const { Schematic } = require("prismarine-schematic");
const { Vec3 } = require("vec3");
// Connect to the server (in 1.12.2)
const bot = mineflayer.createBot({
  host: "example.org",
  username: "email@example.org",
  password: "p@ssw0rd",
  version: "1.12.2",
});
bot.once("spawn", async () => {
  await bot.waitForChunksToLoad();
  // Make the first Schematic
  const schem1 = await Schematic.copy(
    bot.world,
    new Vec3(bot.entity.position.x - 100, 0, bot.entity.position.z - 100),
    new Vec3(bot.entity.position.x + 100, 255, bot.entity.position.z + 100),
    new Vec3(0, 0, 0),
    "1.12.2"
  );
  // write and read the data
  const schem1Data = await schem1.write();
  const schem2 = await Schematic.read(schem1Data, "1.12.2");
  // should be the same, but isn't
  console.log(JSON.stringify(schem1.palette));
  console.log(JSON.stringify(schem2.palette));
});

Expected behavior

Both console outputs should be the same!

Current behavior

[0,112,21,16,17,19,256,208,240,224,1168,48,896,176,336,192,784,151,150,146,145,156,147,148,149,155,497,153,158,144,186,64,178,182,180,188,592,154,157,768,832,868,866,190,640,2802,2810,867,1545,32,1312,608,272,152,611,288,616,1550,3745,2467,273,81,3090,419,427,277,2469,869,416,2341,424,928,3553,2085,2338,3521,2466,2322,3697,3713,3729,2464,1074,1079,3097,1544,3096,2149,2150,290,2326,281,2339,2321,2474,1504,884,885,886,887,888,889,890,891,892,893,894,895,1118,1505,2477,1117,1092]
[0,112,null,null,null,16,256,208,240,224,1168,48,896,null,336,192,784,null,null,null,null,null,null,null,null,null,496,null,null,null,null,64,null,null,null,null,592,null,null,768,832,null,null,176,640,null,2800,null,null,32,1312,null,null,144,null,null,608,null,3744,null,null,80,null,null,null,null,null,864,null,null,416,928,3552,2080,null,3520,null,null,3696,3712,3728,null,null,1072,null,1536,3088,null,2144,288,null,272,2336,2320,null,null,null,null,null,null,null,null,null,null,null,null,null,880,null,1504,2464,1104,1088]

Additional context

As a workaround, you can use const schem2 = Schematic.fromJSON(schem1.toJSON());. To use this, you have to update your package.json to use the git version:

// Change
    "prismarine-schematic": "^1.2.1",
// to 
    "prismarine-schematic": "git+https://github.com/PrismarineJS/prismarine-schematic.git",

Then you need to run npm install again.

PrismarineJS / prismarine-schematic

Writing and then Reading donesn't work in 1.12 #39