Issue Summary

When adding a table that has more than one header row and the header has multiple lines, it will cover the other rows cells. This was observed in Confluence 8.7.2 and 8.8.1 (It did not happen in Confluence 8.6.2)
See video for a better understanding of the issue.

This is reproducible on Data Center: yes

Steps to Reproduce

1. Create a table with multiple rows (20+)
2. Make the 1st row a header with at least 5 lines in it
3. Make more rows below as headers as well
4. Enter edit mode and scroll down

Use the attached page storage format to replicate the issue.

Expected Results

For the header to stay on top of the table but not cover the cells from the below rows

Actual Results

When scrolling up the header lines will cover the cells from the below rows

Workaround

Keep the headers with a single-line.