Emoji rendering with NotoColorEmoji yields an empty image

I might be doing something wrong or naive here, but here's a minimal example:

# Cargo.toml
[package]
name = "cosmic-text-test"
version = "0.1.0"
edition = "2021"

[dependencies]
cosmic-text = "0.12"
fontdb = "0.16"
sys-locale = "0.3"

// src/main.rs
use cosmic_text::{Attrs, Buffer, FontSystem, Metrics, Shaping, SwashCache};
use fontdb::Database;
use std::sync::Arc;

fn main() {
    // Create a custom FontSystem with only an emoji font.
    let emoji_font = Arc::new(include_bytes!("../fonts/NotoColorEmoji-Regular.ttf"));

    let mut font_db = Database::new();
    font_db.load_font_source(fontdb::Source::Binary(emoji_font));

    let locale = sys_locale::get_locale().unwrap_or_else(|| "en-US".to_string());
    let mut font_system = FontSystem::new_with_locale_and_db(locale, font_db);
    let mut swash_cache = SwashCache::new();

    // Shape a buffer
    let mut buffer = Buffer::new_empty(Metrics::relative(32.0, 1.0));
    buffer.set_size(&mut font_system, Some(3000.0), Some(3000.0));

    let default_attrs = Attrs::new();

    buffer.set_text(&mut font_system, "😂", default_attrs, Shaping::Advanced);

    let prune = true;
    buffer.shape_until_scroll(&mut font_system, prune);

    let x = 0.0;
    let y = 0.0;
    let scale = 1.0;

    // Iterate over glyphs
    for run in buffer.layout_runs() {
        dbg!(run.text);

        for glyph in run.glyphs.iter() {
            let physical_glyph = glyph.physical((x, y), scale);
            dbg!(&physical_glyph.cache_key);

            let Some(image) =
                swash_cache.get_image_uncached(&mut font_system, physical_glyph.cache_key)
            else {
                println!("No rasterization needed?");
                continue;
            };

            dbg!(image.source);
            dbg!(image.content);
            dbg!(image.placement);
            dbg!(image.data.len());
        }
    }
}

$ cargo run --release
   Compiling cosmic-text-test v0.1.0 (/Users/brian/projects/cosmic-text-test/cosmic-text-test)
    Finished `release` profile [optimized] target(s) in 1.64s
     Running `target/release/cosmic-text-test`
[src/main.rs:33:9] run.text = "😂"
[src/main.rs:37:13] &physical_glyph.cache_key = CacheKey {
    font_id: ID(
        InnerId(
            1v1,
        ),
    ),
    glyph_id: 2285,
    font_size_bits: 1107296256,
    x_bin: Zero,
    y_bin: Zero,
    flags: CacheKeyFlags(
        0x0,
    ),
}
[src/main.rs:46:13] image.source = Outline
[src/main.rs:47:13] image.content = Mask
[src/main.rs:48:13] image.placement = Placement {
    left: -1,
    top: 0,
    width: 2,
    height: 0,
}
[src/main.rs:49:13] image.data.len() = 0

I'm using the NotoColorEmoji-Regular.ttf file downloaded from Google Fonts.

Any help would be appreciated, I'm assuming this is not the expected output for shaping a singular emoji in a run of text, with a database which consists of only 1 emoji font.

pop-os / cosmic-text

Emoji rendering with NotoColorEmoji yields an empty image #310