Your frustration is completely justified. Layer Parenting is based on a disastrous implementation, introduced more than 5 years ago, called Advanced Layers - a whole hidden structure of Movie Clips. All features based on Advanced Layers are problematic, and the dev team hasn't been able to stabilise the LP system through 6 major and countless minor releases (AA2019 - AA2024) over more than 5 years. They fix one bug only to introduce two new ones in its place. It's a big mess. The best thing that one can do is to avoid touching any of the Advanced Layers based features, such as Parented Layers, Camera, Layer Depth, Frame Effects and so on. It's especially bad if you are a new user. Old, experienced ones usually manage to navigate their way through the jungle of bugs and known issues. There is a lot more that can be written on this topic, but, unfortunately, I don't have the time, and it's probably pointless. As the person on reddit suggested, you should only use symbols and nothing else for animation. Inside those symbols the artwork can be layered, and you can have Drawing Objects and raw shapes. (Use Groups only temprorarily. Groups can bring a lot of trouble to an animation production.) But at character level you should only have one symbol instance per layer. Symbols have proper Registration and Transformation Points and 'permanent' matrices, i.e. can be predictably tweened and transformed in a non-destructive way. Try to un-flip the torso of your toaster, and flip the content inside the symbol instead. It may help to break-apart and create the symbols again, but it would be best if you copy the shapes to a new file. It is difficult to know what exactly is causing this absurd behavior, without having the file. Trying to find the exact reason can be quite time-consuming, so restructuring it may be the better way out. Also, it would be better to nest the facial features inside the toaster/toast symbols and run those as synced timelines. This is how facial animation is done properly. And finally a prediction, based on past observations: In a day or two an Adobe employee, assigned to monitor the forum will pop up here asking you to send them the FLA, so that they can study it and improve Animate. You will supply the file and nothing will come out of it.
... View more