Spreadsheet, user set column width not persisted

Using Spreadsheet 3.1.2, a column size set by the user is not stored on the server, i.e. not included in the JSON. Consequently, it opens in standard column width. How can this be achieved?


Unfortunaetly the problem cannot be reproduced locally.
calling the serialize() method stores the columns config in the result json string.
If the problem still occurs for you pleas,e provide a complete demo, where the problem can be reconstructed.