multi-row UPDATE causing malformed transaction_log entry

The following UPDATE statement is wreaking havoc on the transaction log, causing a malformed message to be entered into the log:

UPDATE `bb` SET `col_int` = 0 WHERE `col_bigint` != 9 ORDER BY `col_bigint`,`col_bigint_key`,`col_bigint_not_null`,`col_bigint_not_null_key`,`col_char_10`,`col_char_1024`,`col_char_1024_key`,`col_char_1024_not_null`,`col_char_1024_not_null_key`,`col_char_10_key`,`col_char_10_not_null`,`col_char_10_not_null_key`,`col_enum`,`col_enum_key`,`col_enum_not_null`,`col_enum_not_null_key`,`col_int`,`col_int_key`,`col_int_not_null`,`col_int_not_null_key`,`col_text`,`col_text_key`,`col_text_not_null`,`col_text_not_null_key`,`pk` LIMIT 6 ;
Query OK, 6 rows affected (0.17 sec)
Rows matched: 6 Changed: 6 Warnings: 0

Transaction_log message for this entry:
NOTE how the entry for key_value 205 is missing vital message elements.

A test case will be coming shortly.

drizzle> select print_transaction_message('transaction_log',307074);
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| print_transaction_message('transaction_log',307074) |
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| transaction_context {
  server_id: 1
  transaction_id: 251
  start_timestamp: 1285169458246687
  end_timestamp: 1285169458305609
}
statement {
  type: UPDATE
  start_timestamp: 1285169458246691
  end_timestamp: 1285169458305607
  update_header {
    table_metadata {
      schema_name: "test"
      table_name: "bb"
    }
    key_field_metadata {
      type: INTEGER
      name: "pk"
    }
    set_field_metadata {
      type: INTEGER
      name: "col_int"
    }
  }
  update_data {
    segment_id: 1
    end_segment: true
    record {
      key_value: "202"
      after_value: "0"
      is_null: false
    }
    record {
      key_value: "203"
      after_value: "0"
      is_null: false
    }
    record {
      key_value: "204"
      after_value: "0"
      is_null: false
    }
    record {
      key_value: "205"
    }
    record {
      key_value: "206"
      after_value: "0"
      is_null: false
    }
    record {
      key_value: "266"
      after_value: "0"
      is_null: false
    }
  }
}
 |
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