Sprite not drawing to other sprite when using transparency

[henryernice]

I'm fiddling around with using sprites and transparency to render an image to the screen with a transparent background.
When i don't set any color as transparent, it draws fine (but with a black background) but when i set the transparent color to 0 when drawing the dinoSpr to the screenSpr it doesn't draw anything at all.

This is without the transparency:

This is when the transparent color is set to 0 (like it is in the script below):

And also just ignore the terrible wiring, i'm working on it :)

I don't know if it's a bug or more likely i made a mistake but help is very much appreciated.

Script and image header file:
ILI9341 issue dinosprite.zip