Hopefully fixed for the next release.
Technical details:
I had to refactor several parts of the bust mannequin rendering code. It should fix multiple render-updating issues. Outside of the image viewer and mannequin edit screens, the bust should ping itself every second or so and if the mannequin values ever change, the mannequin should adjust accordingly. It works pretty well in my tests, though the only glitch is if the mouse hovers over the button tray buttons while the mannequin is transitioning shapes, it'll jump to the final shape since the render is being called multiple times. This is just a quirk of the system there's not much I can do about that issue at the moment. Regardless, this should fix the issue with the mannequin repeating its transition animation every time it pops up on a new screen.