diff --git a/benchmarks/MongoDB.Driver.Benchmarks/Bson/BsonBenchmarkDataTypes.cs b/benchmarks/MongoDB.Driver.Benchmarks/Bson/BsonBenchmarkDataTypes.cs
index 67dce2c7f16..964cb4f6a76 100644
--- a/benchmarks/MongoDB.Driver.Benchmarks/Bson/BsonBenchmarkDataTypes.cs
+++ b/benchmarks/MongoDB.Driver.Benchmarks/Bson/BsonBenchmarkDataTypes.cs
@@ -320,9 +320,13 @@ public sealed class DeepPocoRoot
 
 public sealed class DeepPocoNode
 {
+    [BsonIgnoreIfNull]
     public DeepPocoNode right { get; set; }
+    [BsonIgnoreIfNull]
     public DeepPocoNode left { get; set; }
 
+    [BsonIgnoreIfNull]
     public string rightValue { get; set; }
+    [BsonIgnoreIfNull]
     public string leftValue { get; set; }
 }
diff --git a/benchmarks/MongoDB.Driver.Benchmarks/Bson/BsonDecodingBenchmark.cs b/benchmarks/MongoDB.Driver.Benchmarks/Bson/BsonDecodingBenchmark.cs
index 9495675f233..d91802a21b4 100644
--- a/benchmarks/MongoDB.Driver.Benchmarks/Bson/BsonDecodingBenchmark.cs
+++ b/benchmarks/MongoDB.Driver.Benchmarks/Bson/BsonDecodingBenchmark.cs
@@ -80,6 +80,6 @@ public IEnumerable<BsonBenchmarkData> BenchmarkDataSources() =>
     [
         new("extended_bson/flat_bson.json", "Flat", 75_310_000, typeof(FlatPoco)),
         new("extended_bson/full_bson.json", "Full", 57_340_000, typeof(FullPoco)),
-        new("extended_bson/deep_bson.json", "Deep", 19_640_000, typeof(DeepPocoRoot))
+        new("extended_bson/deep_bson.json", "Deep", 22_840_000, typeof(DeepPocoRoot))
     ];
 }
diff --git a/benchmarks/MongoDB.Driver.Benchmarks/Bson/BsonEncodingBenchmark.cs b/benchmarks/MongoDB.Driver.Benchmarks/Bson/BsonEncodingBenchmark.cs
index c0f6cba087e..2f4f862c9f1 100644
--- a/benchmarks/MongoDB.Driver.Benchmarks/Bson/BsonEncodingBenchmark.cs
+++ b/benchmarks/MongoDB.Driver.Benchmarks/Bson/BsonEncodingBenchmark.cs
@@ -82,6 +82,6 @@ public IEnumerable<BsonBenchmarkData> BenchmarkDataSources() =>
     [
         new("extended_bson/flat_bson.json", "Flat", 75_310_000, typeof(FlatPoco)),
         new("extended_bson/full_bson.json", "Full", 57_340_000, typeof(FullPoco)),
-        new("extended_bson/deep_bson.json", "Deep", 19_640_000, typeof(DeepPocoRoot))
+        new("extended_bson/deep_bson.json", "Deep", 22_840_000, typeof(DeepPocoRoot))
     ];
 }