When animating a custom property from UI, update callback is not triggered. Is this a expected behavior if it is then is there a way to trigger update callback when property is changed using key frames.
Known problem since ages. Afaik the correct behavior for some reason. Animation can though trigger driver calculation, so you may consider using a driver instead. Another option that I personally tried back in 2.7 even, is frame_change_post handler which fires on every animation frame change, so you can refresh the property there which would trigger an update.
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I’m not sure How to go about driver calculation. But It does not matter that much if i get it work with using frame_change_post handler. I’m using this handler in my code to draw in 3d view.