Blur effect does not work properly on some Android devices

[LeRomino]

I recently tested the Flutter package "glassmorphism" on several Android smartphones and noticed a problem. Instead of seeing a blurred effect, I get a slightly transparent gray/white background. This problem was observed on a device running Android 9 with version One UI 1.0.

I've checked the existing problems for this package and haven't found any similar problems reported. I would like to know if this is a known problem and if there is a solution to fix it.

Thank you for your help.