Bug Render textures are black on some Android devices

Hello. I am having some trouble with render textures on my Android device.
When the scene with render texture is starting, my object that has material with a render texture is black. However, on most other devices everything works fine - the object has required semi-transparent color. Actually, I have a function Clear that is called after pressing some button on my GUI. So, when I press this button render texture clears correctly and gets desired view. But I cannot make this function perform fix texture if I call it in the Start method - everything is black anyway.
It is kind of strange for me why render textures work differently on several devices. My device is a Honor 8S KSA-LX9.
I would be really appreciative if someone could tell me how this issue can be resolved.
Thanks in advance

Screenshots with configuration: