I have some issues with the use of translationMode in the customShader of tiles

Why do all models become semi transparent when translucencyMode is set to 2, even if my alpha is equal to 1.0,
I hope to control transparency based on the value of alpha, but if translucencyMode: 2 is not set, alpha will not take effect at all
This is an
Example
The model in the example is not what I am currently using, but there is also this issue