Black screen on custom slugcat's sleep screen when graphics are high

[full gyro]

I'm using slugbase and I only have one flat hibernation image. When the graphics are low or medium, the flat image is displayed correctly. When the graphics are high, instead of the sleep screen, it's just a black screen and nothing can be done. There's nothing to do about it, so I have to close the game. What can I do?

[timid epoch]

The flat image is only used on low or medium. It isn't used on high.

You'll need to make the composite image that other scenes use for it to display on high graphics, since technically right now you have nothing to display on high graphics.

[full gyro]

Is there anything I can do to make the flat image display on the high graphics too?

Here's what my sleep_slugname.json looks like

[timid epoch]

Not without code.