Resizing issue with Flexbox

I'm having some resizing issues when the resizable box is inside a Flexbox container and aligned to the bottom of a div.

Here is the code to reproduce the issue:
https://codesandbox.io/s/amazing-meitner-0k6pk?fontsize=14&hidenavigation=1&theme=dark

The problem is with the N handle. S and E works just fine.