Tables from a Confluence 8.9.3 view page lose formatting when copied and pasted into an external platform like a Google email.(Edit= This also happens in 9.2.1 and 9.3.1)
Table's borders and cell colors are lost.

Regression test

• Confluence version 8.9.3, table loses formatting
• Confluence version 8.5.11, table keeps formatting

How To Replicate

1. In Confluence 8.9.3/9.2.1/9.3.1 version create a page
2. On this page create a table 4x4 with text content in it
3. Save the page
4. From the page view mode highlight the table and copy it
5. Open an external platform like a Google email
6. Paste the copied table into the email thread

The table will lose its formatting like the border lines. The same steps taken but from a Confluence 8.5.11 results in the table showing correctly in the email thread as the screenshots below

Edit: Please note that this happen with webapps such as Gmail, and also in standalone applications as Outlook, Thunderbird, Office, Libreoffice, etc.