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Image.SetKill(true) does not work on DzSave

See original GitHub issue

I am having trouble aborting a DzSave call.

Sample Code:

using NetVips;

Console.WriteLine("Starting");

// setup parameters
var testImage = @"sample_640×426.tif";
var savePath = "output";
var saveName = savePath + "/" + "testPyramid";

if (!Directory.Exists(savePath))
    Directory.CreateDirectory(savePath);

// open image
using var image = Image.NewFromFile(testImage);

// start creation of pyramid in background task
VipsException? vipsException = null;
var createPyramidTask = Task.Run(() =>
{
    {
        try
        {
            image.Dzsave(filename: saveName,
                tileSize: 10,
                overlap: 0,
                suffix: ".tif",
                depth: Enums.ForeignDzDepth.Onetile
            );
        }
        catch (VipsException ex)
        {
            vipsException = ex;
        }
    }
});

var start = DateTime.Now;

// wait one second and set kill flag. Wait until task returns.
await Task.Run(async () =>
{

    while (DateTime.Now - start < TimeSpan.FromSeconds(2))
        Thread.Sleep(10);

    image.SetKill(true);
    Console.WriteLine("killflag set");
    
    await createPyramidTask.ConfigureAwait(false);
});

Console.WriteLine("duration {0}", DateTime.Now - start);
Console.WriteLine("is killed? {0}", image.IsKilled());
Console.WriteLine("exception: {0}", vipsException?.Message);

Console.ReadKey();

Directory.Delete(savePath, true);

Sample image is attached: sample_640×426.zip This gets the following output in the console:

Starting
killflag set
duration 00:00:11.4808162
is killed? True
exception:

So it says it was killed, but instead of terminating after abount 1 second, it more than 10 times as long. And looking in the output folder, the whole image pyramid was actually generated.

Does SetKill() not work on DzSave?