deep cloning

src/ImageSharp/Formats/Tiff/TiffDecoderMetadataCreator.cs

@@ -28,6 +28,7 @@ internal static class TiffDecoderMetadataCreator
         if (!ignoreMetadata)
         {
             var tiffMetadata = imageMetaData.GetTiffMetadata();
+            var framesMetadata = new List<TiffFrameMetadata>(frames.Count);
             for (int i = 0; i < frames.Count; i++)
             {
                 ImageFrameMetadata frameMetaData = frames[i];
@@ -46,8 +47,10 @@ internal static class TiffDecoderMetadataCreator
                     frameMetaData.IccProfile = new IccProfile(iccProfileBytes.Value);
                 }
 
-                tiffMetadata.Frames.Add(frameMetaData.GetTiffMetadata());
+                framesMetadata.Add(frameMetaData.GetTiffMetadata());
             }
+
+            tiffMetadata.Frames = framesMetadata;
         }
 
         return imageMetaData;

src/ImageSharp/Formats/Tiff/TiffFrameMetadata.cs

@@ -28,6 +28,7 @@ public class TiffFrameMetadata : IDeepCloneable
         this.Compression = other.Compression;
         this.PhotometricInterpretation = other.PhotometricInterpretation;
         this.Predictor = other.Predictor;
+        this.InkSet = other.InkSet;
     }
 
     /// <summary>

src/ImageSharp/Formats/Tiff/TiffMetadata.cs

@@ -19,7 +19,20 @@ public class TiffMetadata : IDeepCloneable
     /// Initializes a new instance of the <see cref="TiffMetadata"/> class.
     /// </summary>
     /// <param name="other">The metadata to create an instance from.</param>
-    private TiffMetadata(TiffMetadata other) => this.ByteOrder = other.ByteOrder;
+    private TiffMetadata(TiffMetadata other)
+    {
+        this.ByteOrder = other.ByteOrder;
+        this.FormatType = other.FormatType;
+
+        var frames = new List<TiffFrameMetadata>(other.Frames.Count);
+        foreach (var otherFrame in other.Frames)
+        {
+            var frame = (TiffFrameMetadata)otherFrame.DeepClone();
+            frames.Add(frame);
+        }
+
+        this.Frames = frames;
+    }
 
     /// <summary>
     /// Gets or sets the byte order.
@@ -37,7 +50,7 @@ public class TiffMetadata : IDeepCloneable
     /// <value>
     /// The frames.
     /// </value>
-    public IList<TiffFrameMetadata> Frames { get; set; } = new List<TiffFrameMetadata>();
+    public IReadOnlyList<TiffFrameMetadata> Frames { get; set; } = Array.Empty<TiffFrameMetadata>();
 
     /// <inheritdoc/>
     public IDeepCloneable DeepClone() => new TiffMetadata(this);