Unable to use (save) "modified" column value as sql_last_value

Elastic Stack Logstash
1

Among other things, following is an input which worked without any issue in version 5.6.5,

  jdbc {
    jdbc_driver_library => "/etc/logstash/mssql-jdbc-6.2.2.jre8.jar"
    jdbc_driver_class => "com.microsoft.sqlserver.jdbc.SQLServerDriver"
    jdbc_connection_string => "jdbc:sqlserver://DB_IP:PORT"
    jdbc_user => "user_name"
    jdbc_password => "password"

    schedule => "*/5 * * * *"

    statement => "SELECT * FROM db.table WHERE modified > :sql_last_value"

    use_column_value => true
    tracking_column => "modified"

    jdbc_fetch_size => 1000
    jdbc_page_size => 1000
    jdbc_paging_enabled => true
    last_run_metadata_path => "/var/lib/logstash/.logstash_jdbc_last_run"
  }

The column modified has type datetime (SQL Server). This worked as expect in Logstash version 5.6.5 and the .logstash_jdbc_last_run file was updated with the value from modified column just fine.

After upgrading to 6.7.0, this setup no longer works. The .logstash_jdbc_last_run file always ends up getting --- 0 value. Setting tracking_column_type => "timestamp" yields following error,

[2019-05-02T14:19:00,157][WARN ][logstash.inputs.jdbc] Exception when executing
JDBC query {:exception=>#<Sequel::DatabaseError: Java::ComMicrosoftSqlserverJdbc::SQLServerException: 
Implicit conversion from data type varchar to timestamp is not allowed. 
Use the CONVERT function to run this query.>}
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