Description:
I am using LibreOffice Writer version 6.3.5.2 (x64) under Windows.
Absolutely everytime that I apply specific shaping to my tables inside my writer document, it is never kept when I will reopen the document.
So when I put some borders and background colors to my table cells, I can be sure it will have disapear when I will reopen the document. Even if I create a specific table style into the styles section. 
I have the same problem with my writer models document (.ott) where the tables styling is not kept and the new documents created from the model don't have the table look I originally created in the model.

When I open a model, tables will everytime have a "basic look" with no border, no background colors and no cells margins. As if the specified attributes were not kept with the document saving.

Steps to Reproduce:
1.Create a table and apply styling defining specific attributes
2.Save and close the document.
3.When the document is reopened right after, the same table will be seen only with a "basic style" without the attributes defined.

Actual Results:
See "steps to reproduce"

Expected Results:
Defined attributes for the table disapeared.


Reproducible: Always


User Profile Reset: Yes


OpenGL enabled: Yes

Additional Info:
Keep all the attributes that I defined for my table.