Description:
Check boxes that have a linked cell, and also have formatting (coloured background and coloured border) are lost when saving to a XLSX file.


Steps to Reproduce:
1. Create a Check box in Calc linked to a Cell
2. Provide some formatting to the checkbox (e.g. coloured background, border, etc.)
3. Save to XLSX file

Actual Results:
The Check box is not linked to any cell
All of the formatting of the checkbox is lost in the XLSX file.

Expected Results:
The linked cell and formatting should be retained.


Reproducible: Always


User Profile Reset: No



Additional Info:
The XLSX file when opened in Excel should have reproduced the checkbox as displayed in Calc.