Why did the decal become black after the light is built?

[SchucoAccount]

I have a few decals in the level.
But after the light was built, they all turned to black. Like this:

Does anybody know why this happened?
Please help me.
Thanks in advance.

[SchucoAccount]

The scale is inverted. That’s why/

[Vlahui_on_pc]

Thanks bro, had the same problem.