How to stop displaying warnings for wrong platforms?

So when packaging the game to Win64, in the project settings only win64 is selected as valid target platforms, yet we get 300+ warnings like this this materials failing to compile for other platforms:

UATHelper: Packaging (Windows (64-bit)): LogInit: Display: LogShaderCompilers: Warning: X:\FF-Git\Content\FF_GARAGE\Meshes\materials\lambert2.uasset: Failed to compile Material for platform GLSL_150, Default Material will be used in game.

AFAIK this is failing for Vulkan/html related targets? All materials actually work fine in the packaged build too.