Why does the splashscreen_image show on Android?

Bare workflow
eas-cli 5.4.9

When launching the app (even in production mode) a splash screen will briefly show and the image is located in app/src/main/res/drawable/splashscreen_image.png

However I can’t see that image referenced in my app.

splashscreen.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:drawable="@color/splashscreen_background"/>
</layer-list>

colors.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<resources>
  <color name="splashscreen_background">#FFFFFF</color>
</resources>

Based on this I expect the splash to be a solid colour.

Inside app.json I don’t have any mention of splash.