Copying tables from first header cell to last cell results in a single line when pasted

Summary

When copying a table with the following methods:

1. Hover and click on first header cell up to last cell and pasting it on either a macro or on a page, notice that the table loses its format
2. Hover and click on the first header cell + shift direct keyboard arrow to last cell, notice that the table loses its format

See video for reference

Notes

This does not happen on Confluence server (e.g. 6.11)