Image editor bug, grouped items flipped incorrectly

[jaltekruse]

It initially shows a cool feature, flipping all of the elements of the group to allow mirroring an overall drawing with multiple elements, but upon mouseUp it also flips them vertically.

This looks to be working fine in fabric JS alone, so must be the toast editor messing it up.
http://fabricjs.com/kitchensink

toast_flip_group_11-11-2021.mp4