textures with transparency don't work after building a game

Hello, I have a problem that I am not sure how to solve, you will see, I am creating a game and I have decided to do a test build to see how the game goes, and it turns out that there are textures that the transparency is not seen as you will see in one of the images.
The problem I have is that in the editor it doesn't look like that and instead when I do the build the edges of the textures look black and don't show through, how do I fix this?
I've been searching the net what could be the problem and it turns out that while the build is being processed in the console I get a single warning that says: "releasing render texture that is set to be rendertexture.active"
and I don't know if it has anything to do with it... .and if that is the problem how do I fix it?

 

What shader are you using? Is this the built-in renderer or one of the scriptable Pipelines?

 

built-in renderer