Static Splash Screen and Alpha Issue

I'm currently porting my iOS Unity game to Android and one thing which has me stumped is the static splash screen.

On my iOS build the alpha works perfectly fine for the given splash. However, on Android the alpha channel on the splash screen seems to get filled with a colour picked from the image.

Here's the example splash screen:
https://imgur.com/a/DmPZQiL

Here's what it looks like when built to an apk and running on any device:
https://imgur.com/1jPf6bW