Used Jira SD 4.5.1
When sending an email from MS Outlook to SD, cells without information are loaded without borders. Order of actions:
1) in Outlook (MS Office 2016, others have not checked), we respond to an email from Jira
2) Insert a table from Excel, in which some of the cells are empty.
3) Send
4) in the comment, all empty cells are lost.
The same is true when creating a new email.
When formatting table borders in Excel (but not in Outlook), it is formed correctly in Jira.
I assume that it will be played in any browser. Now checked for Firefox 74, Chrome 80, IE11

