Code macro does not maintain all empty lines when copy and pasted

Summary

Recently, this bug was fixed:
https://jira.atlassian.com/browse/CONF-28582

This is a problem where Confluence would remove empty lines when copying/pasting code in the Code Macro.

However, the fix version is still causing some empty lines to be removed after saving.

This case specifically, when we add 'n' lines in a row to copied/pasted text, only 'n-1' are preserved, one is deleted.

Environment

Tested in Mac OS.

Steps to Reproduce

1. Open a text editor and write:

   Line 1
   Line 2
   

2. Copy it and paste in a code macro in a Confluence page
3. Remove all empty lines added (because for some reason many are added)
4. Save it (no empty lines exist)
5. Edit the page again
6. Add an empty line between Line 1 and Line 2
7. Save it

Expected Results

The empty line is preserved.

Actual Results

The empty line disappears.

Notes

If you add several lines in a row, all but one is preserved.

Workaround

If you want 'n' empty lines, add 'n+1'.