diff --git a/src/ImageSharp/Formats/Jpeg/Components/Encoder/YCbCrForwardConverter{TPixel}.cs b/src/ImageSharp/Formats/Jpeg/Components/Encoder/YCbCrForwardConverter{TPixel}.cs
index f5ef770914..6d3620c622 100644
--- a/src/ImageSharp/Formats/Jpeg/Components/Encoder/YCbCrForwardConverter{TPixel}.cs
+++ b/src/ImageSharp/Formats/Jpeg/Components/Encoder/YCbCrForwardConverter{TPixel}.cs
@@ -13,8 +13,8 @@ internal static class YCbCrForwardConverter<TPixel>
     {
         public static void LoadAndStretchEdges(RowOctet<TPixel> source, Span<TPixel> dest, Point start, Size sampleSize, Size totalSize)
         {
-            DebugGuard.MustBeBetweenOrEqualTo(start.X, 1, totalSize.Width - 1, nameof(start.X));
-            DebugGuard.MustBeBetweenOrEqualTo(start.Y, 1, totalSize.Height - 1, nameof(start.Y));
+            DebugGuard.MustBeBetweenOrEqualTo(start.X, 0, totalSize.Width - 1, nameof(start.X));
+            DebugGuard.MustBeBetweenOrEqualTo(start.Y, 0, totalSize.Height - 1, nameof(start.Y));
 
             int width = Math.Min(sampleSize.Width, totalSize.Width - start.X);
             int height = Math.Min(sampleSize.Height, totalSize.Height - start.Y);
diff --git a/tests/ImageSharp.Tests/Formats/Bmp/BmpDecoderTests.cs b/tests/ImageSharp.Tests/Formats/Bmp/BmpDecoderTests.cs
index 2b42b65f00..e64d8452f3 100644
--- a/tests/ImageSharp.Tests/Formats/Bmp/BmpDecoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Bmp/BmpDecoderTests.cs
@@ -20,6 +20,7 @@
 // ReSharper disable InconsistentNaming
 namespace SixLabors.ImageSharp.Tests.Formats.Bmp
 {
+    [Collection("RunSerial")]
     [Trait("Format", "Bmp")]
     public class BmpDecoderTests
     {
diff --git a/tests/ImageSharp.Tests/Formats/Bmp/BmpEncoderTests.cs b/tests/ImageSharp.Tests/Formats/Bmp/BmpEncoderTests.cs
index 90e6cf43f3..f338c1affc 100644
--- a/tests/ImageSharp.Tests/Formats/Bmp/BmpEncoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Bmp/BmpEncoderTests.cs
@@ -19,6 +19,7 @@
 // ReSharper disable InconsistentNaming
 namespace SixLabors.ImageSharp.Tests.Formats.Bmp
 {
+    [Collection("RunSerial")]
     [Trait("Format", "Bmp")]
     public class BmpEncoderTests
     {
diff --git a/tests/ImageSharp.Tests/Formats/Gif/GifDecoderTests.cs b/tests/ImageSharp.Tests/Formats/Gif/GifDecoderTests.cs
index c3250d72c5..c0df1e400d 100644
--- a/tests/ImageSharp.Tests/Formats/Gif/GifDecoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Gif/GifDecoderTests.cs
@@ -17,6 +17,7 @@
 // ReSharper disable InconsistentNaming
 namespace SixLabors.ImageSharp.Tests.Formats.Gif
 {
+    [Collection("RunSerial")]
     [Trait("Format", "Gif")]
     public class GifDecoderTests
     {
diff --git a/tests/ImageSharp.Tests/Formats/Gif/GifEncoderTests.cs b/tests/ImageSharp.Tests/Formats/Gif/GifEncoderTests.cs
index 3a0f188ce3..bd24e1a8d9 100644
--- a/tests/ImageSharp.Tests/Formats/Gif/GifEncoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Gif/GifEncoderTests.cs
@@ -14,6 +14,7 @@
 // ReSharper disable InconsistentNaming
 namespace SixLabors.ImageSharp.Tests.Formats.Gif
 {
+    [Collection("RunSerial")]
     [Trait("Format", "Gif")]
     public class GifEncoderTests
     {
diff --git a/tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.cs b/tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.cs
index 67df6a8814..d13a9696c3 100644
--- a/tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Jpg/JpegDecoderTests.cs
@@ -22,6 +22,7 @@
 namespace SixLabors.ImageSharp.Tests.Formats.Jpg
 {
     // TODO: Scatter test cases into multiple test classes
+    [Collection("RunSerial")]
     [Trait("Format", "Jpg")]
     public partial class JpegDecoderTests
     {
diff --git a/tests/ImageSharp.Tests/Formats/Jpg/JpegEncoderTests.cs b/tests/ImageSharp.Tests/Formats/Jpg/JpegEncoderTests.cs
index 3c48865c71..8e12b04be9 100644
--- a/tests/ImageSharp.Tests/Formats/Jpg/JpegEncoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Jpg/JpegEncoderTests.cs
@@ -20,6 +20,7 @@
 
 namespace SixLabors.ImageSharp.Tests.Formats.Jpg
 {
+    [Collection("RunSerial")]
     [Trait("Format", "Jpg")]
     public class JpegEncoderTests
     {
diff --git a/tests/ImageSharp.Tests/Formats/Png/PngDecoderTests.cs b/tests/ImageSharp.Tests/Formats/Png/PngDecoderTests.cs
index 7147f82d68..9832aeb7ba 100644
--- a/tests/ImageSharp.Tests/Formats/Png/PngDecoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Png/PngDecoderTests.cs
@@ -16,6 +16,7 @@
 // ReSharper disable InconsistentNaming
 namespace SixLabors.ImageSharp.Tests.Formats.Png
 {
+    [Collection("RunSerial")]
     [Trait("Format", "Png")]
     public partial class PngDecoderTests
     {
diff --git a/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs b/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs
index 58d733c4f0..50bacfba4d 100644
--- a/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Png/PngEncoderTests.cs
@@ -15,6 +15,7 @@
 
 namespace SixLabors.ImageSharp.Tests.Formats.Png
 {
+    [Collection("RunSerial")]
     [Trait("Format", "Png")]
     public partial class PngEncoderTests
     {
diff --git a/tests/ImageSharp.Tests/Formats/Tga/TgaDecoderTests.cs b/tests/ImageSharp.Tests/Formats/Tga/TgaDecoderTests.cs
index 2a7aca8820..ac94a8fc87 100644
--- a/tests/ImageSharp.Tests/Formats/Tga/TgaDecoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Tga/TgaDecoderTests.cs
@@ -16,6 +16,7 @@
 // ReSharper disable InconsistentNaming
 namespace SixLabors.ImageSharp.Tests.Formats.Tga
 {
+    [Collection("RunSerial")]
     [Trait("Format", "Tga")]
     public class TgaDecoderTests
     {
diff --git a/tests/ImageSharp.Tests/Formats/Tga/TgaEncoderTests.cs b/tests/ImageSharp.Tests/Formats/Tga/TgaEncoderTests.cs
index d6eb333a20..1ad4f9a846 100644
--- a/tests/ImageSharp.Tests/Formats/Tga/TgaEncoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Tga/TgaEncoderTests.cs
@@ -13,6 +13,7 @@
 // ReSharper disable InconsistentNaming
 namespace SixLabors.ImageSharp.Tests.Formats.Tga
 {
+    [Collection("RunSerial")]
     [Trait("Format", "Tga")]
     public class TgaEncoderTests
     {
diff --git a/tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs b/tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs
index 6b82f4281c..a007cd3a9c 100644
--- a/tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs
@@ -17,6 +17,7 @@
 
 namespace SixLabors.ImageSharp.Tests.Formats.Tiff
 {
+    [Collection("RunSerial")]
     [Trait("Format", "Tiff")]
     public class TiffDecoderTests
     {
diff --git a/tests/ImageSharp.Tests/Formats/Tiff/TiffEncoderTests.cs b/tests/ImageSharp.Tests/Formats/Tiff/TiffEncoderTests.cs
index 09505692fc..0286671ae8 100644
--- a/tests/ImageSharp.Tests/Formats/Tiff/TiffEncoderTests.cs
+++ b/tests/ImageSharp.Tests/Formats/Tiff/TiffEncoderTests.cs
@@ -17,6 +17,7 @@
 
 namespace SixLabors.ImageSharp.Tests.Formats.Tiff
 {
+    [Collection("RunSerial")]
     [Trait("Format", "Tiff")]
     public class TiffEncoderTests
     {