Why does Sprite disappear in a Unity build?

Question

Unity

In a 2D platformer, I did grayboxing (floor and ceiling) using the Sprite Share Controller, after which they already applied it to the top of the graphics.


In general, after creating the build, everything works fine, all the sprites are drawn, but the black Sprite Controller simply disappears, it is not visible and the Persian runs through the void, what should I do?

Here is the sprite itself

Answer 1

The answer is probably stupid, but still ...
Checked the Transform Position on the Z axis? Perhaps the background overlaps this sprite?

Answer 2

Change order in layer