Failed to find shader map for default material WorldGridMaterial in windows shipping build

Development Platform & Builds
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Hi!
I encountered an issue with my packaged game. As I try to start a shipping build on windows it will crash immediately, while the development build runs without any issues.
I started to have this error a few days ago, even tho I didn’t change anything in the engine (builded from source) nor in the project that could be relevant to the default WorldGridMaterial in any way. Also I reverted my modifications just to be sure but the crash still happens.
I found some Warnings in the building logs that were material related and fixed them, but the crash didn’t get solved.

Here is the message I get in the crash window:
LowLevelFatalError [File:G:\UnrealEngineSource\UnrealEngineSourceCode\Engine\Source\Runtime\Engine\Private\Materials\MaterialShared.cpp] [Line: 2713]
Failed to find shader map for default material WorldGridMaterial(/Engine/EngineMaterials/WorldGridMaterial.WorldGridMaterial)! Please make sure cooking was successful (No inline shaders, null GTSM)

Any idea what can cause this?

Thanks in advance!

2

I could create a shipping build that works now.
I had to set the “RequireRelaunch” to false in the engine’s OnlineSubsystemSteam.cpp in the “ConfigureSteamInitDevOptions” function.
Don’t know why it caused this issue, but now it works.