The svg export use absolute coordinates in the svg:d statement, and is thus immune to the bug - I've pasted the exact same svg:d statement from the bugdoc's content.xml into it, and adjusted the viewport - now, firefox displays it exactly as LibreOffice.
Created attachment 58940
Tweaked svg from before
The svg export use absolute coordinates in the svg:d statement, and is thus immune to the bug - I've pasted the exact same svg:d statement from the bugdoc's content.xml into it, and adjusted the viewport - now, firefox displays it exactly as LibreOffice.