I noticed that the long back hair sprite does not seem to render specially for right facing sprites on the Idle animation sheet. Right facing sprites also seems to render incorrectly for walking with this option too but more in a something is in the wrong place rather than outright missing kind of way.
Other than that great tool so far. Looking forward to future development.
Thanks for the bug report! We've just put out a minor update to fix this!
https://sleeping-robot-games.itch.io/sprite-sheet-creator/devlog/952599/hotfix-v...