I have tested your issue with v7.0.2 and the result is same as v2.5.4.x. The formatting is not rendered for the table in the converted ods file. We are working on some porting issues of ODS format for some time, we fixed some issues too. I have logged a ticket with an id: CELLSJAVA-40006. We will look into it soon.
After further investigation, we come to know we cannot support Table related
objects for ODS format, currently. In fact the OpenOffice does not support this feature too (you may check it by yourself) when opening Excel file.