Kivy: Sequential image handling issue for raspberry pi

When attempting to 'play' a sequential image .zip (as opposed to a .gif) on kivy through Rasberry Pi (PipaOS / Raspbian) with the kivy.uix.image include, the first 20 or so frames seem to play with no issue, then the rest cut out.

The remaining sequential image frames display as a plain black coloured canvas, however the frame duration still seems to be in effect. (sequential image would normally take ~3 seconds to loop, image goes black after ~0.8 seconds, remains black for the next 2.2 seconds and restarts the loop.)

Code to use for testing:

''' to be saved as main.py '''

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.image import Image
from kivy.uix.boxlayout import BoxLayout


Builder.load_string('''
<Interface>:
    orientation: 'vertical'
    Image:
        source: 'loader_anim.zip'
        anim_delay: 0.05
''')

class Interface(BoxLayout):
    pass

class SettingsApp(App):
    def build(self):
        return Interface()

SettingsApp().run()

''' save this [https://github.com/LovelyHorse/prometheus/blob/master/assets/loader_anim.zip?raw=true] file in the same directory as "loader_anim.zip", and run main.py '''

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