When playing as a lefty, if the Player is holding food in their main hand and has a tool in their off hand (for example, cookies in their left hand and a sword in their right, that's what I was holding when I discovered the bug), and eat, the Player's right arm will perform the eating animation rather than the left, for example, the player looks like they are eating the sword instead of the cookies.

The attached clip shows the bug and how to reconstruct it.