Scene bundles on iOS seem not to import Mecanim readonly states for models. It works ok on th editor and other platforms like Android, but not on iOS. Models do not play any animation. Maybe the associated controller is the one being disregarded (?)
Example and steps to reproduce it provided, among other errors within the same project, on case 754917.
Example and steps to reproduce it provided, among other errors within the same project, on case 754917.