MySQL Connector Fails to Capture Setting NOT NULL Column to DEFAULT NULL

{
  "name": "my-sql-connector",
  "connector.class": "io.debezium.connector.mysql.MySqlConnector",
  "database.serverTimezone": "America/Los_Angeles",
  "snapshot.mode": "schema_only",
  "offset.binlog.table": "binlog_offsets",
  "offset.downstream.topic.table": "downstream_topic_to_offset_map",
  "offset.flush.interval.ms": "60000",
  "offset.flush.timeout.ms": "45000",
  "internal.key.converter": "org.apache.kafka.connect.json.JsonConverter",
  "internal.value.converter": "org.apache.kafka.connect.json.JsonConverter",
  "datatype.propagate.source.type": ".+\\.(.*)CHAR,.+\\.(.*)VARCHAR,.+\\.CHARACTER.*,.+\\.BINARY,.+\\.VARBINARY,.+\\.TINYBLOB,.+\\.TINYTEXT,.+\\.MEDIUMBLOB,.+\\.MEDIUMTEXT,.+\\.LONGBLOB,.+\\.LONGTEXT,.+\\.BLOB,.+\\.TEXT,.+\\.FLOAT.*,.+\\.DOUBLE.*,.+\\.REAL.*,.+\\.DATE.*,.+\\.TIME.*,.+\\.TIMESTAMP.*,.+\\.YEAR.*,.+\\.ENUM.*,.+\\.SET.*,.+\\.([A-Z])*INT.*,.+\\.DATETIME.*",
  "converters": "int,float,real,datetime,boolean,timestamp,year",
  "snapshot.lock.timeout.ms": "30000"
}
 

-- blob table
CREATE TABLE simple_blob_table (
    `id` int(11) NOT NULL AUTO_INCREMENT,
    `blob_column` blob NOT NULL,
    PRIMARY KEY (`id`))ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

insert into simple_blob_table (blob_column) values (_binary 'Hic sunt dracones.');

ALTER TABLE simple_blob_table MODIFY `blob_column` blob DEFAULT NULL;

insert into simple_blob_table (id) values (2);

-- varchar table 
CREATE TABLE simple_varchar_table (
    `id` int(11) NOT NULL AUTO_INCREMENT,
    `varchar_column` varchar(132) COLLATE utf8_unicode_ci NOT NULL,
    PRIMARY KEY (`id`))ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

insert into simple_varchar_table (varchar_column) values ('Hic sunt dracones.');

ALTER TABLE simple_varchar_table MODIFY `varchar_column` varchar(132) DEFAULT NULL;

insert into simple_varchar_table (id) values (2);

// expected blob field avro schema
{
  "default": null,
  "name": "blob_column",
  "doc": "Default field doc string",
  "type": [
    "null",
    "bytes"
  ],
  "maxlen": 65535
}

// expected varchar field avro schema
{
  "default": null,
  "name": "varchar_column",
  "doc": "Default field doc string",
  "type": [
    "null",
    "string"
  ],
  "maxlen": 132
} 

// actual blob field avro schema
{
  "name": "blob_column",
  "doc": "Default field doc string",
  "type": "bytes",
  "maxlen": 65535
}

// actual varchar field avro schema 
{
  "name": "varchar_column",
  "doc": "Default field doc string",
  "type": "string",
  "maxlen": 132
}