Many to many mapping doesn't work correctly

In Syndesis, I want to map a single field of all object from the source collection on a field in the target collection.

However, when I run the integration, the target message contains only array with one null element

Body: [[{"arr":[{"name":null}]}]] 

Message before DataMapper

Body: [[{"id":1,"task":"test1","completed":0}, {"id":2,"task":"test2","completed":0}, {"id":3,"task":"test3","completed":0}]] 

Message after DataMapper

Body: [[{"arr":[{"name":null}]}]] 

Expected message

Body: [[{"arr":[{"name":"test1"}, {"name":"test2"}, {"name":"test3"}]}]] 

Reproducible on upstream version `1.12.0-20210420` with AtlasMap version `2.2.0-M.4`

The default postrgesql connection is used as a source (select * from todo)
AMQ step is used as a target with JSON instance
e.g.

{
  "officeNumber": 1,
  "arr": [
    {
      "name":"test1",
      "surname":"surname1",
      "addresses":[
        {
          "street":"street1"
        },
        {
          "street":"street2"
        }
      ]
    }
  ]
}

The integration is in the attachments.

This use case worked on previous version `1.12.0-20210414` with AtlasMap version `2.1.6`
Examples:
Message before DataMapper

Body: [] 

Message after DataMapper

Body: [[{"arr":[]}]]

====
Message before DataMapper

Body: [[{"id":1,"task":"test1","completed":0}, {"id":2,"task":"test2","completed":0}, {"id":3,"task":"test3","completed":0}]] 

Message after DataMapper

Body: [[{"arr":[{"name":"test1"}, {"name":"test2"}, {"name":"test3"}]}]]