Use new not shared options.

src/ImageSharp/Formats/Bmp/BmpDecoderOptions.cs

@@ -9,7 +9,7 @@ namespace SixLabors.ImageSharp.Formats.Bmp;
 public sealed class BmpDecoderOptions : ISpecializedDecoderOptions
 {
     /// <inheritdoc/>
-    public DecoderOptions GeneralOptions { get; init; } = DecoderOptions.Default;
+    public DecoderOptions GeneralOptions { get; init; } = new();
 
     /// <summary>
     /// Gets the value indicating how to deal with skipped pixels,

src/ImageSharp/Formats/Jpeg/JpegDecoderOptions.cs

@@ -9,7 +9,7 @@ namespace SixLabors.ImageSharp.Formats.Jpeg;
 public sealed class JpegDecoderOptions : ISpecializedDecoderOptions
 {
     /// <inheritdoc/>
-    public DecoderOptions GeneralOptions { get; init; } = DecoderOptions.Default;
+    public DecoderOptions GeneralOptions { get; init; } = new();
 
     /// <summary>
     /// Gets the resize mode.

tests/ImageSharp.Tests/TestUtilities/Tests/TestImageProviderTests.cs

@@ -429,7 +429,7 @@ public class TestImageProviderTests
 
     private class TestDecoderOptions : ISpecializedDecoderOptions
     {
-        public DecoderOptions GeneralOptions { get; init; } = DecoderOptions.Default;
+        public DecoderOptions GeneralOptions { get; init; } = new();
     }
 
     private class TestDecoderWithParametersOptions : ISpecializedDecoderOptions
@@ -438,6 +438,6 @@ public class TestImageProviderTests
 
         public int Param2 { get; init; }
 
-        public DecoderOptions GeneralOptions { get; init; } = DecoderOptions.Default;
+        public DecoderOptions GeneralOptions { get; init; } = new();
     }
 }