It seems that some Android devices, particularly those running older versions like Android 9, may have issues displaying animations smoothly due to hardware acceleration problems. Disabling hardware acceleration can allow animations to display, but it may result in stuttering or unsmooth playback. This is a known issue with certain Android devices and versions, and it appears that updating the device's Android version or using a newer device may resolve the issue. Additionally, ensuring that you are using the latest Spine Runtimes and checking for any device-specific updates or patches could help improve performance.