When creating checkboxes in LibreOffice, they disappear when saved in xlsx and reopened.
Steps to Reproduce:
1. Open a calc spreadsheet and create some checkboxes
2. save as xlsx
3. reopen and notice that the checkboxes are gone
Checkboxes are visible
User Profile Reset: No
User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0
I can confirm with LO 6 and 4.1
The checkbox disappears in every case after reopening the XLSX file. I created the checkbox manually or received a file with a checkbox and it disappeared after saving the file and closing the LO calc 4.5 or 6.
same in 188.8.131.52