Try reproduce https://github.com/guitarrapc/SkiaSharp.QrCode/issues/54

ConsoleApp5.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net6.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="SkiaSharp.NativeAssets.Linux.NoDependencies" Version="2.88.2" />
    <PackageReference Include="SkiaSharp.QrCode" Version="0.6.0" />
  </ItemGroup>

  <ItemGroup>
    <None Update="Untitled.png">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
  </ItemGroup>

</Project>

Program.cs

using SkiaSharp.QrCode.Models;
using SkiaSharp;
using SkiaSharp.QrCode;

var url = "https://example.com";
var byteIcon = File.ReadAllBytes(@"Untitled.png");
var icon = new IconData
{
    Icon = SKBitmap.Decode(byteIcon),
    IconSizePercent = 10,
};
using var generator = new QRCodeGenerator();
var qr = generator.CreateQrCode(url, ECCLevel.L);
var info = new SKImageInfo(512, 512);
using var surface = SKSurface.Create(info);
var canvas = surface.Canvas;
canvas.Render(qr, info.Width, info.Height, SKColor.Parse("ffffff"), SKColor.Parse("000000"), icon);
using var image = surface.Snapshot();
using var data = image.Encode(SKEncodedImageFormat.Png, 100);
data.SaveTo(new FileStream($"../Generated_{System.Runtime.InteropServices.RuntimeInformation.OSDescription}.png", FileMode.CreateNew));

Another sample for non-black outline.

WSL2 Ubuntu 22.04 result

Windows 11 result