[BUG] Not full stream reading for bmp/png images

[SharkoTaras]

Description

I'm tying to resize large png/bmp image and save in jpeg. To get image i'm downloading it from azure blob. Default stream downloading chunk size is 4mb. When png is larger than 4mb it looks like image creates only for first 4mb, but image size is correct. When I'm copying blob stream into memory stream it works correctly. Even if I change default size of stream chunk for example into 50mb png/bmp images belove 50mb downloads correctly

Code

`
await using var image = await blobStorage.GetBlob(blobName, cancellationToken);
await using MemoryStream memoryStream = new();
await image.CopyToAsync(memoryStream, cancellationToken);
memoryStream.Seek(0, SeekOrigin.Begin);
using var originalImage = SKBitmap.Decode(memoryStream);

using var thumbnail = new SKBitmap(
_thumbnailOptions.Width,
_thumbnailOptions.Height,
originalImage.ColorType,
originalImage.AlphaType);

var sampling = new SKSamplingOptions(SKFilterMode.Linear, SKMipmapMode.Linear);
await using var thumbnailStorageStream = await blobStorage.OpenWrite(thumbnailName, "image/jpeg", cancellationToken);
var success =
originalImage.ScalePixels(thumbnail, sampling) &&
thumbnail.Encode(thumbnailStorageStream, SKEncodedImageFormat.Jpeg, quality: 100);`

Expected Behavior

Full data from stream reads into image

Actual Behavior

Only specific data length downloads into image for png/bmp

Version of SkiaSharp

3.116.0 (Current)

Last Known Good Version of SkiaSharp

2.88.9 (Previous)

IDE / Editor

Visual Studio (Windows)

Platform / Operating System

Linux, Windows

Platform / Operating System Version

No response

Devices

No response

Relevant Screenshots

No response

Relevant Log Output

Code of Conduct

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