URP custom lit shader graph gives me weird black bits filling in the mesh where it should be alpha

I'm trying to apply a shader to this white + grey object to make a more modular set of walls.

But for some reason, the URP custom lit shader graph treats the part of the mesh that should be transparent as black.

Any ideas? I knew how to fix this in the old shader graph, but now I have no clue what to do.

 

It's because you asked to draw alpha part in black by multiplying it to the base color, which result in (0,0,0) when 1-alpah is 0.

Simply connect the alpha from the texture sample to the alpha block of your master, and remove this multiplication if no necessary.

 

Yes, this is the answser.