Particle SubUV Expression Does Not Use Texture Input

Particle SubUV expression does not use texture input.
Per User:

ParticleSubUV function in Material Editor do not take Texture from Tex node.

Since int32 UMaterialExpressionParticleSubUV::Compile(class FMaterialCompiler* Compiler, int32 OutputIndex) in MaterialExpressions.cpp do not have process for Tex input (`TextureObject.Expression`) that its parent class have.

Is Particle SubUV intended not to use Texture input? then I believe Tex pin need to be hidden.

1. Open Editor, create a new material.
2. In material editor, add Particle SubUV expression, texture object parameter, and texture sample.
3. Link nodes as shown in attached image

Result: Particle SubUV does not accept Texture from Tex input. Connecting Particle SubUV output to main material node results in Error message "Missing ParticleSubUV input texture"