Comment by Cthulhu_
> "QA user X mentioned that the text overflows when text zoom is at 300%. Fix it."
We've adopted a stance that functionality trumps design at larger text scaling. Second, overflowing is preferable to truncating (also as per the WCAG, which says you shouldn't truncate / no information should be lost on larger text scales)
Yes, functionality trumps design if something has to give -- but what is the text overflowing into? Often it is overflowing into other text, and so now neither is readable. Or it is pushing other content unreachably outside the viewport. In this case, it's a lose-lose situation, in that both functionality and design have suffered.
For example, NYT with 200% text-only scaling: https://i.imgur.com/zp7pDW3.png