Shader Variants not work in AB

I tried ShaderVariantCollection to collect variants and put SVC and relevent shaders into one AssetBundle.
At runtime I loaded the shader bundle, got svc and warmed up, then loaded some materials using diffferent variants.
2 out of 4 materials failed to find correct variants.

Variants are defined as: #pragma shader_feature _ RED BLUE GREEN
and SVC include 4 variants:
Normal <no keywords>
Normal RED
Normal GREEN
Normal BLUE
the last 2 failed.

Unity version: 5.5.2 & 5.6.0
Anyone have some idea how to fix this?

 

I noticed that if you use shader_feature and your shader is a different bundle that your materials the shader will get stripped has if there was no keyword used. Solutions I found was to either use multi_compile instead, but this will make the shader file much bigger depending on how many variations you have, or include a material using the shader variant you want in the same bundle than the shaders.

I though that shader variant was to prevent that too, but looks like it's not working atm. I saw some post where a guy from unity said that they are working on a fix for that though.

 

Thank you very much Yan, it works exactly as you suggested.
I consulted some unity guy and he mentioned (compiled/optimized) shader variant code is saved with material.
he suggested me use ShaderVariantCollection.
Hope this bug could be fixed soon!