bevy_ninepatch weird gaps

[Atakku]

I'm just starting out with bevy and testing things out, seems that the tiles have weird gaps when the final size is uneven.
Here is the code:

use bevy::prelude::*;
use bevy_ninepatch::{NinePatchBuilder, NinePatchBundle, NinePatchData, NinePatchPlugin};

fn main() {
  App::build()
    .add_plugins(DefaultPlugins)
    .add_plugin(NinePatchPlugin::<()>::default())
    .add_startup_system(setup.system())
    .run();
}

fn setup(
    mut commands: Commands,
    asset_server: Res<AssetServer>,
    mut nine_patches: ResMut<Assets<NinePatchBuilder<()>>>,
) {
    let panel_texture_handle = asset_server.load("gui8.png");

    // load the 9-Patch as an assets and keep an `Handle<NinePatchBuilder<()>>`
    let nine_patch_handle = nine_patches.add(NinePatchBuilder::by_margins(32, 32, 32, 32));

    commands.spawn_bundle(
        // this component bundle will be detected by the plugin, and the 9-Patch UI element will be added as a child
        // of this entity
        NinePatchBundle {
            style: Style {
                margin: Rect::all(Val::Auto),
                justify_content: JustifyContent::Center,
                align_items: AlignItems::Center,
                size: Size::new(Val::Px(256.), Val::Px(257.)),
                ..Default::default()
            },
            nine_patch_data: NinePatchData {
                nine_patch: nine_patch_handle,
                texture: panel_texture_handle,
                ..Default::default()
            },
            ..Default::default()
        },
    );

    commands.spawn_bundle(UiCameraBundle::default());
}

Assets used:
gui8.png

Screenshot of the issue: