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DZSave massive increase in memory usage in netvips.native.win-x64 8.11 vs 8.8

See original GitHub issue

When using different versions I am seeing massive memory differences when using DZSave against an image made of multiple tiles. In this case ~1000 4 band pngs at 2117 x 2048 netvips.native.win-x64 8.11 uses about 7gb of memory where as 8.8 uses less than 2gb.
It’s worth noting that 8.11 also seems to be about 25% faster so I suspect some optimisation has occurred.

  NetVips.NetVips.Concurrency = 2;
  Environment.SetEnvironmentVariable("VIPS_DISC_THRESHOLD", "10m");
  Cache.Max = 0;

  var tiles = new List<Image>();

  foreach(var path in vipsImageRepo.imageFilePaths)
  {
      var page = Image.NewFromFile(path, access: Enums.Access.Random, memory: false);
      tiles.Add(page);
  }

  var result = Image.Arrayjoin(tiles.ToArray(), shim: 0, vspacing: 0, across: 1, valign: Enums.Align.Low );
  result.Dzsave(outputPath, tileSize: 800, depth: Enums.ForeignDzDepth.One, suffix: ".jpg[Q=95]", container: Enums.ForeignDzContainer.Fs);