Chart titles disappear after closing and reopening file

Hello. I’m using LibreOffice Calc Version: 4.4.0.3 on Ubuntu 12.04

I made a few charts, and added titles to the charts. When I save the file (in .xlsx format), close the file and open it again, the titles are gone (Both title and sub-title).

To add Titles I tried both adding the title in the initial creation (Insert → Chart → Chart elements)
And I tried double clicking the chart → Right click → Add titles.

Am I doing something wrong or is it a bug?

EDIT: I tried saving it as .ods, and it worked as expected. Now I have a problem because the recipient wants this as .xlsx… Anyone have any idea?

Hi
I have a similar problem in that the Series names are lost. The save / open cycle also looses chart line formating in a Stock Chart Type 1 using High, Low and Close values.

I’m using LibreOffice 5.1.4.2; Build ID: f99d75f39f1c57ebdd7ffc5f42867c12031db97a
CPU Threads: 4; OS Version: Windows 6.2; UI Render: GL;
Locale: en-GB (en_GB)

Regards
Tim_eme

Also experiencing this issue in LibreOffice 6.3.1.2