
Default PixelEmojis is formatted as 7.

A information text from https://minecraft.fandom.com/wiki/Tutorials/Creating_a_resource_pack

Formatting pack.mcmeta
Open pack.mcmeta in a text editor or IDE of your choice and type or copy+paste the following:

{
  "pack": {
    "pack_format": 7,
    "description": "Tutorial Resource Pack"
  }
}
"pack_format"
The value of "pack_format" tells Minecraft what release the resource pack is designed for, and is different for certain versions. The following list what versions each value is associated with:

1 for versions 1.6.1 – 1.8.9
2 for versions 1.9 – 1.10.2
3 for versions 1.11 – 1.12.2
4 for versions 1.13 – 1.14.4
5 for versions 1.15 – 1.16.1
6 for versions 1.16.2 – 1.16.5
7 for versions 1.17.x
8 for 1.18 snapshots

