diff --git a/go/mysql/binlog_event_mysql56_test.go b/go/mysql/binlog_event_mysql56_test.go
index 9ad38473205..161e48a50ae 100644
--- a/go/mysql/binlog_event_mysql56_test.go
+++ b/go/mysql/binlog_event_mysql56_test.go
@@ -626,6 +626,83 @@ func TestMySQL56PartialUpdateRowsEvent(t *testing.T) {
 			numRows: 1,
 			want:    "JSON_INSERT(%s, _utf8mb4'$.misc', _utf8mb4\"{\\\"address\\\":\\\"1012 S Park\\\", \\\"town\\\":\\\"Hastings\\\", \\\"state\\\":\\\"MI\\\"}\")",
 		},
+		{
+			name: "JSON field not updated",
+			// The mysqlbinlog -vvv --base64-output=decode-rows output for the following event:
+			// ### UPDATE `vt_commerce`.`customer`
+			// ### WHERE
+			// ###   @1=1 /* LONGINT meta=0 nullable=0 is_null=0 */
+			// ###   @2='newalice@domain.com' /* VARSTRING(128) meta=128 nullable=1 is_null=0 */
+			// ###   @3='{"day": "friday", "role": "manager", "color": "red", "salary": 100, "favorite_color": "black"}' /* JSON meta=4 nullable=1 is_null=0 */
+			// ### SET
+			// ###   @1=101 /* LONGINT meta=0 nullable=0 is_null=0 */
+			// ###   @2='newalice@domain.com' /* VARSTRING(128) meta=128 nullable=1 is_null=0 */
+			// ###   @3=@3 /* JSON meta=4 nullable=1 is_null=0 */
+			// ### UPDATE `vt_commerce`.`customer`
+			// ### WHERE
+			// ###   @1=2 /* LONGINT meta=0 nullable=0 is_null=0 */
+			// ###   @2='newbob@domain.com' /* VARSTRING(128) meta=128 nullable=1 is_null=0 */
+			// ###   @3='{"day": "friday", "role": "manager", "color": "red", "salary": 99, "favorite_color": "black"}' /* JSON meta=4 nullable=1 is_null=0 */
+			// ### SET
+			// ###   @1=102 /* LONGINT meta=0 nullable=0 is_null=0 */
+			// ###   @2='newbob@domain.com' /* VARSTRING(128) meta=128 nullable=1 is_null=0 */
+			// ###   @3=@3 /* JSON meta=4 nullable=1 is_null=0 */
+			// ### UPDATE `vt_commerce`.`customer`
+			// ### WHERE
+			// ###   @1=3 /* LONGINT meta=0 nullable=0 is_null=0 */
+			// ###   @2='newcharlie@domain.com' /* VARSTRING(128) meta=128 nullable=1 is_null=0 */
+			// ###   @3='{"day": "monday", "role": "manager", "color": "red", "hobby": "skiing", "salary": 99}' /* JSON meta=4 nullable=1 is_null=0 */
+			// ### SET
+			// ###   @1=103 /* LONGINT meta=0 nullable=0 is_null=0 */
+			// ###   @2='newcharlie@domain.com' /* VARSTRING(128) meta=128 nullable=1 is_null=0 */
+			// ###   @3=@3 /* JSON meta=4 nullable=1 is_null=0 */
+			// ### UPDATE `vt_commerce`.`customer`
+			// ### WHERE
+			// ###   @1=4 /* LONGINT meta=0 nullable=0 is_null=0 */
+			// ###   @2='newdan@domain.com' /* VARSTRING(128) meta=128 nullable=1 is_null=0 */
+			// ###   @3='{"day": "friday", "role": "manager", "color": "red", "salary": 99, "favorite_color": "black"}' /* JSON meta=4 nullable=1 is_null=0 */
+			// ### SET
+			// ###   @1=104 /* LONGINT meta=0 nullable=0 is_null=0 */
+			// ###   @2='newdan@domain.com' /* VARSTRING(128) meta=128 nullable=1 is_null=0 */
+			// ###   @3=@3 /* JSON meta=4 nullable=1 is_null=0 */
+			// ### UPDATE `vt_commerce`.`customer`
+			// ### WHERE
+			// ###   @1=5 /* LONGINT meta=0 nullable=0 is_null=0 */
+			// ###   @2='neweve@domain.com' /* VARSTRING(128) meta=128 nullable=1 is_null=0 */
+			// ###   @3='{"day": "friday", "role": "manager", "color": "red", "salary": 100, "favorite_color": "black"}' /* JSON meta=4 nullable=1 is_null=0 */
+			// ### SET
+			// ###   @1=105 /* LONGINT meta=0 nullable=0 is_null=0 */
+			// ###   @2='neweve@domain.com' /* VARSTRING(128) meta=128 nullable=1 is_null=0 */
+			// ###   @3=@3 /* JSON meta=4 nullable=1 is_null=0 */
+			rawEvent: []byte{
+				194, 74, 100, 103, 39, 46, 144, 133, 54, 77, 3, 0, 0, 77, 128, 0, 0, 0, 0, 153, 0, 0, 0, 0, 0, 1, 0, 2, 0, 3, 255, 255, 0, 1, 0, 0, 0, 0, 0, 0, 0,
+				19, 110, 101, 119, 97, 108, 105, 99, 101, 64, 100, 111, 109, 97, 105, 110, 46, 99, 111, 109, 97, 0, 0, 0, 0, 5, 0, 96, 0, 39, 0, 3, 0, 42, 0, 4, 0,
+				46, 0, 5, 0, 51, 0, 6, 0, 57, 0, 14, 0, 12, 71, 0, 12, 78, 0, 12, 86, 0, 5, 100, 0, 12, 90, 0, 100, 97, 121, 114, 111, 108, 101, 99, 111, 108, 111,
+				114, 115, 97, 108, 97, 114, 121, 102, 97, 118, 111, 114, 105, 116, 101, 95, 99, 111, 108, 111, 114, 6, 102, 114, 105, 100, 97, 121, 7, 109, 97,
+				110, 97, 103, 101, 114, 3, 114, 101, 100, 5, 98, 108, 97, 99, 107, 1, 1, 0, 101, 0, 0, 0, 0, 0, 0, 0, 19, 110, 101, 119, 97, 108, 105, 99, 101, 64,
+				100, 111, 109, 97, 105, 110, 46, 99, 111, 109, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 17, 110, 101, 119, 98, 111, 98, 64, 100, 111, 109, 97, 105,
+				110, 46, 99, 111, 109, 97, 0, 0, 0, 0, 5, 0, 96, 0, 39, 0, 3, 0, 42, 0, 4, 0, 46, 0, 5, 0, 51, 0, 6, 0, 57, 0, 14, 0, 12, 71, 0, 12, 78, 0, 12, 86,
+				0, 5, 99, 0, 12, 90, 0, 100, 97, 121, 114, 111, 108, 101, 99, 111, 108, 111, 114, 115, 97, 108, 97, 114, 121, 102, 97, 118, 111, 114, 105, 116, 101,
+				95, 99, 111, 108, 111, 114, 6, 102, 114, 105, 100, 97, 121, 7, 109, 97, 110, 97, 103, 101, 114, 3, 114, 101, 100, 5, 98, 108, 97, 99, 107, 1, 1, 0,
+				102, 0, 0, 0, 0, 0, 0, 0, 17, 110, 101, 119, 98, 111, 98, 64, 100, 111, 109, 97, 105, 110, 46, 99, 111, 109, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0,
+				21, 110, 101, 119, 99, 104, 97, 114, 108, 105, 101, 64, 100, 111, 109, 97, 105, 110, 46, 99, 111, 109, 89, 0, 0, 0, 0, 5, 0, 88, 0, 39, 0, 3, 0, 42,
+				0, 4, 0, 46, 0, 5, 0, 51, 0, 5, 0, 56, 0, 6, 0, 12, 62, 0, 12, 69, 0, 12, 77, 0, 12, 81, 0, 5, 99, 0, 100, 97, 121, 114, 111, 108, 101, 99, 111, 108,
+				111, 114, 104, 111, 98, 98, 121, 115, 97, 108, 97, 114, 121, 6, 109, 111, 110, 100, 97, 121, 7, 109, 97, 110, 97, 103, 101, 114, 3, 114, 101, 100, 6,
+				115, 107, 105, 105, 110, 103, 1, 1, 0, 103, 0, 0, 0, 0, 0, 0, 0, 21, 110, 101, 119, 99, 104, 97, 114, 108, 105, 101, 64, 100, 111, 109, 97, 105, 110,
+				46, 99, 111, 109, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 17, 110, 101, 119, 100, 97, 110, 64, 100, 111, 109, 97, 105, 110, 46, 99, 111, 109, 97, 0,
+				0, 0, 0, 5, 0, 96, 0, 39, 0, 3, 0, 42, 0, 4, 0, 46, 0, 5, 0, 51, 0, 6, 0, 57, 0, 14, 0, 12, 71, 0, 12, 78, 0, 12, 86, 0, 5, 99, 0, 12, 90, 0, 100,
+				97, 121, 114, 111, 108, 101, 99, 111, 108, 111, 114, 115, 97, 108, 97, 114, 121, 102, 97, 118, 111, 114, 105, 116, 101, 95, 99, 111, 108, 111, 114,
+				6, 102, 114, 105, 100, 97, 121, 7, 109, 97, 110, 97, 103, 101, 114, 3, 114, 101, 100, 5, 98, 108, 97, 99, 107, 1, 1, 0, 104, 0, 0, 0, 0, 0, 0, 0, 17,
+				110, 101, 119, 100, 97, 110, 64, 100, 111, 109, 97, 105, 110, 46, 99, 111, 109, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 17, 110, 101, 119, 101, 118,
+				101, 64, 100, 111, 109, 97, 105, 110, 46, 99, 111, 109, 97, 0, 0, 0, 0, 5, 0, 96, 0, 39, 0, 3, 0, 42, 0, 4, 0, 46, 0, 5, 0, 51, 0, 6, 0, 57, 0, 14,
+				0, 12, 71, 0, 12, 78, 0, 12, 86, 0, 5, 100, 0, 12, 90, 0, 100, 97, 121, 114, 111, 108, 101, 99, 111, 108, 111, 114, 115, 97, 108, 97, 114, 121, 102,
+				97, 118, 111, 114, 105, 116, 101, 95, 99, 111, 108, 111, 114, 6, 102, 114, 105, 100, 97, 121, 7, 109, 97, 110, 97, 103, 101, 114, 3, 114, 101, 100,
+				5, 98, 108, 97, 99, 107, 1, 1, 0, 105, 0, 0, 0, 0, 0, 0, 0, 17, 110, 101, 119, 101, 118, 101, 64, 100, 111, 109, 97, 105, 110, 46, 99, 111, 109, 0,
+				0, 0, 0,
+			},
+			numRows: 5,
+			want:    "",
+		},
 	}
 
 	for _, tc := range testCases {