DataMapper map only one element from GoogleSpreadsheet sheets collection

We have integration which takes spreadsheet properties and publish sheet titles into AMQ.
Steps:
Get spreadsheet properties -> Log -> DataMapper -> Log -> Publish message
Example of JMS message:

{"sheets":[{"sheet":"id"}]}

Example of GoogleSpreadsheet (what the first step returns) according to integration log:

Body: [[GoogleSpreadsheet [spreadsheetId=1_OLTcj_y8NwST9KHhg8etB10xr6t3TrzaFXwW2dhpXw, title=Test-Data, url=https://docs.google.com/spreadsheets/d/1_OLTcj_y8NwST9KHhg8etB10xr6t3TrzaFXwW2dhpXw/edit, sheets=[GoogleSheet [sheetId=0, index=0, title=Sheet1], GoogleSheet [sheetId=274107068, index=1, title=sheet2], GoogleSheet [sheetId=31438639, index=2, title=pivot-columns], GoogleSheet [sheetId=789378340, index=3, title=pivot rows], GoogleSheet [sheetId=1430313962, index=4, title=chart], GoogleSheet [sheetId=1812574774, index=5, title=Chart4352]]]]] 

Here is how the mapping looks like:

In syndesis version (20210201), the result message contains all sheet titles.

Body: [[{"sheets":[{"sheet":"Sheet1"}, {"sheet":"sheet2"}, {"sheet":"pivot-columns"}, {"sheet":"pivot rows"}, {"sheet":"chart"}, {"sheet":"Chart4352"}]}]] 

But after AtlasMap update, in Syndesis version 20210210, the result message contains only one sheet title.

Body: [[{"sheets":[{"sheet":"Sheet1"}]}]]

The mapping is the same

I don't know whether that is a bug or I should change something in the integration according to AtlasMap changes.

I can send exported integration directly via gChat since it contains credentials to our Google Sheets so I have not uploaded it to the attachments.