WebGL Asset Bundles in Editor cause shader failure

Hi, most of my project is packed in asset bundles. Target is WebGL 1.0, using 2017.3.0f3.

It works fine in the Browser but in the editor all my shaders/materials seem to fail. Most materials are magenta and some standard shaders only show color without any shading. Once I switch the shader in the inspector it works fine again.
Seems to be a shader missload, how can I fix this?

You probably need a separate set of asset bundles for use in the editor. (With build target Windows/MacOS)