diff --git a/core/src/main/java/com/alibaba/fastjson2/JSONReaderJSONB.java b/core/src/main/java/com/alibaba/fastjson2/JSONReaderJSONB.java
index 2ca173bc5..0ae9a5540 100644
--- a/core/src/main/java/com/alibaba/fastjson2/JSONReaderJSONB.java
+++ b/core/src/main/java/com/alibaba/fastjson2/JSONReaderJSONB.java
@@ -3669,6 +3669,10 @@ final class JSONReaderJSONB
                 }
                 return decimal.intValue();
             }
+            case BC_TIMESTAMP_MILLIS:
+                long millis = getLongBE(bytes, check7(offset, end));
+                offset += 8;
+                return (int) millis;
             default:
                 if (type >= BC_STR_ASCII_FIX_MIN && type <= BC_STR_ASCII_FIX_MAX) {
                     int strlen = type - BC_STR_ASCII_FIX_MIN;
diff --git a/core/src/test/java/com/alibaba/fastjson2/issues_3400/Issue3471.java b/core/src/test/java/com/alibaba/fastjson2/issues_3400/Issue3471.java
new file mode 100644
index 000000000..3b6ce431a
--- /dev/null
+++ b/core/src/test/java/com/alibaba/fastjson2/issues_3400/Issue3471.java
@@ -0,0 +1,45 @@
+package com.alibaba.fastjson2.issues_3400;
+
+import com.alibaba.fastjson2.JSONB;
+import com.alibaba.fastjson2.JSONReader;
+import com.alibaba.fastjson2.JSONWriter;
+import org.junit.jupiter.api.Test;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+public class Issue3471 {
+    @Test
+    public void test() throws Exception {
+        byte[] jsonBytes = JSONB.toBytes(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse("2025-04-01 12:47:10"),
+                JSONWriter.Feature.WriteClassName,
+                JSONWriter.Feature.FieldBased,
+                JSONWriter.Feature.ErrorOnNoneSerializable,
+                JSONWriter.Feature.ReferenceDetection,
+                JSONWriter.Feature.WriteNulls,
+                JSONWriter.Feature.NotWriteDefaultValue,
+                JSONWriter.Feature.NotWriteHashMapArrayListClassName,
+                JSONWriter.Feature.WriteNameAsSymbol);
+        JSONB.parseObject(jsonBytes, byte.class,
+                JSONReader.Feature.UseDefaultConstructorAsPossible,
+                JSONReader.Feature.ErrorOnNoneSerializable,
+                JSONReader.Feature.IgnoreAutoTypeNotMatch,
+                JSONReader.Feature.UseNativeObject,
+                JSONReader.Feature.FieldBased);
+        jsonBytes = JSONB.toBytes(new Date(),
+                JSONWriter.Feature.WriteClassName,
+                JSONWriter.Feature.FieldBased,
+                JSONWriter.Feature.ErrorOnNoneSerializable,
+                JSONWriter.Feature.ReferenceDetection,
+                JSONWriter.Feature.WriteNulls,
+                JSONWriter.Feature.NotWriteDefaultValue,
+                JSONWriter.Feature.NotWriteHashMapArrayListClassName,
+                JSONWriter.Feature.WriteNameAsSymbol);
+        JSONB.parseObject(jsonBytes, byte.class,
+                JSONReader.Feature.UseDefaultConstructorAsPossible,
+                JSONReader.Feature.ErrorOnNoneSerializable,
+                JSONReader.Feature.IgnoreAutoTypeNotMatch,
+                JSONReader.Feature.UseNativeObject,
+                JSONReader.Feature.FieldBased);
+    }
+}