Unable to load image from io.BytesIO in Kivy

I'm trying to get Kivy to load image which was saved in memory by PIL after editing. I'm using answers from this question as method: Load image from memory in Kivy.

However, it does not work. This is my code:

from PIL import Image as PIL_Image

from kivy.app import App
from kivy.core.image import Image as CoreImage
from kivy.uix.image import Image

import io

class MyApp(App):

    def build(self):

        image_from_memory = CoreImage(memory_saved_image, ext='png')
        image_to_show = Image(source='')
        image_to_show.texture = image_from_memory.texture

        return image_to_show

if __name__ == "__main__":
    
    memory_saved_image = io.BytesIO()

    pil_edited_image = PIL_Image.open('test.png')

    # some non-related PIL image editing in here

    pil_edited_image.save(memory_saved_image, 'png')

    MyApp().run()

And this is my error message, including related log-message:

[WARNING] [Image       ] Unable to load image <<_io.BytesIO object at 0x000000000372F108>>
 Traceback (most recent call last):
   File "c:/Users/Вова/Desktop/SO example.py", line 26, in <module>
     MyApp().run()
   File "C:\Users\Вова\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\app.py", line 829, in run
     root = self.build()
   File "c:/Users/Вова/Desktop/SO example.py", line 13, in build
     image_from_memory = CoreImage(memory_saved_image, ext='png')
   File "C:\Users\Вова\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\core\image\__init__.py", line 547, in __init__
     self.load_memory(arg, ext, filename)
   File "C:\Users\Вова\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\core\image\__init__.py", line 783, in load_memory
     keep_data=self._keep_data)
   File "C:\Users\Вова\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\core\image\__init__.py", line 221, in __init__
     self._data = self.load(kwargs.get('rawdata'))
   File "C:\Users\Вова\AppData\Local\Programs\Python\Python37\lib\site-packages\kivy\core\image\img_sdl2.py", line 47, in load
     raise Exception('SDL2: Unable to load image')
 Exception: SDL2: Unable to load image

When I try to open this image from memory using PIL, it works, so the memory is not corrupt.