Textures with transparency are not working properly

[LittlePeter]

Hi, I'm new at modding, I have java knowledge so I can defend myself.
I'll give you context.
I'm learning from scratch with the documentation, GitHub repositories and YouTube videos.
And when I'm learning how to register blocks, custom blocks, and custom blocks with custom models and I found that the transparency of a texture are now black or white (depending how much colors are in the texture)

 

This is an example BlockItem, everything with that is ok, even in the hand renders well
 

Spoiler

But, when I place the block this happens.
 

Spoiler

And happens with every block or custom model that has a transparent texture, even with minecraft textures, such as a door; loses the transparency and  becomes white.

So, am I missing something? Am I doing something wrong? 
All the json documents seems to be right, the code seems to be right ? 
So idk what's happening.
Any hit of what am i doing wrong? 

Edited April 12, 2020 by LittlePeter
I spell wrong some words

[DavidM]

You need to set the render type of the block to CUTOUT during FMLClientSetupEvent via RenderTypeLookup::setRenderLayer.

An example is here.