Artifacts on the image extracted from gif

[KubaZ2]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am using the latest version of Magick.NET
• I have searched open and closed issues to ensure it has not already been reported

Description

I have the gif:

I use MagickImageCollection to storage it.
I want to get the 5th frame of it, I make it using imageCollection[5], expected result:

but the Magick.net gives me this:

(it has transparent holes)

That is strange, because if I make a gif from the imageCollection, it looks good (to be honest, the original gif is a gif processed by Magick.net and there was the same problem with it as this issue).

Steps to Reproduce

using ImageMagick;
using System;
using System.Net.Http;

MagickImageCollection imageCollection = new(await new HttpClient().GetStreamAsync("https://user-images.githubusercontent.com/77853483/122071182-d5f23000-cdf6-11eb-92fa-359fdfdb5de8.gif"), MagickFormat.Gif);
imageCollection.Write($"{AppDomain.CurrentDomain.BaseDirectory}gif.gif", MagickFormat.Gif);
imageCollection[5].Write($"{AppDomain.CurrentDomain.BaseDirectory}gif.png", MagickFormat.Png);

System Configuration

• Magick.NET version: Magick.NET-Q8-x64 7.24.1
• Environment (Operating system, version and so on): Windows 10 Home 64-bit (10.0, Build 19042) (19041.vb_release.191206-1406)
• Additional information:
  CPU: Intel Core i5-4440 3.10GHz
  GPU: GeForce GTX 1060 6GB
  GPU Drivers: 466.77